DEBUG-2510 Document cbindgen dependency

[p-datadog]

What does this PR do?

Adds cbindgen and its required version to the readme to the requirements section.

Motivation

Building C headers requires cbindgen which is not mentioned in the readme.

Ubuntu package of cbindgen is of an old version which does not work, producing cryptic errors.

Additional Notes

None

How to test the change?

N/A

[pr-commenter]

Benchmarks

Comparison

Parameters

	Baseline	Candidate
config	baseline	candidate
git_branch	main	cbindgen-version
git_commit_date	1719836665	1719839453
git_commit_sha	f66cd95	ffa9f74
iterations	705.0	711.0

See matching parameters

	Baseline	Candidate
ci_job_date	1719839693	1719839693
ci_job_id	558037238	558037238
ci_pipeline_id	37978356	37978356
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1 metrics, 0 unstable metrics.

Candidate

Candidate benchmark details

Group 1

iterations	config	cpu_model	ci_job_date	ci_job_id	ci_pipeline_id	git_commit_sha	git_commit_date	git_branch
711.0	candidate	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	1719839693	558037238	37978356	ffa9f74	1719839453	cbindgen-version

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sql/obfuscate_sql_string	execution_time	70.344µs	70.419µs ± 0.031µs	70.420µs ± 0.019µs	70.436µs	70.469µs	70.480µs	70.499µs	0.11%	0.048	-0.296	0.04%	0.003µs	1	100

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sql/obfuscate_sql_string	execution_time	[70.413µs; 70.425µs] or [-0.008%; +0.008%]	None	None	None

Warnings

Scenario: sql/obfuscate_sql_string, Metric: execution_time

Sample size is 100, which is lower than 105.

The minimal sample size in case of normal distribution to achieve significance
level of 0.05 for difference of means with effect size Cohen's d = 0.5 must be at
least 105.

The conclusions from confidence intervals may be invalid.
---------------------------------------------------------------------------

Baseline

Baseline benchmark details

Group 1

iterations	config	cpu_model	ci_job_date	ci_job_id	ci_pipeline_id	git_commit_sha	git_commit_date	git_branch
705.0	baseline	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	1719839693	558037238	37978356	f66cd95	1719836665	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sql/obfuscate_sql_string	execution_time	70.919µs	71.006µs ± 0.035µs	71.004µs ± 0.025µs	71.031µs	71.061µs	71.076µs	71.078µs	0.10%	-0.080	-0.326	0.05%	0.004µs	1	100

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sql/obfuscate_sql_string	execution_time	[70.999µs; 71.013µs] or [-0.010%; +0.010%]	None	None	None

Warnings

Scenario: sql/obfuscate_sql_string, Metric: execution_time

Measurements are autocorrelated.

Autocorrelation is present for lags 1..10.

The measurements are not independent, thus confidence intervals
may be less precise.
---------------------------------------------------------------------------

Scenario: sql/obfuscate_sql_string, Metric: execution_time

Sample size is 100, which is lower than 105.

The minimal sample size in case of normal distribution to achieve significance
level of 0.05 for difference of means with effect size Cohen's d = 0.5 must be at
least 105.

The conclusions from confidence intervals may be invalid.
---------------------------------------------------------------------------

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.38%. Comparing base (f66cd95) to head (ffa9f74).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #514   +/-   ##
=======================================
  Coverage   70.38%   70.38%           
=======================================
  Files         204      204           
  Lines       27835    27835           
=======================================
  Hits        19591    19591           
  Misses       8244     8244           

Components	Coverage Δ
crashtracker	16.70% <ø> (ø)
datadog-alloc	98.76% <ø> (ø)
data-pipeline	51.15% <ø> (ø)
data-pipeline-ffi	0.00% <ø> (ø)
ddcommon	86.12% <ø> (ø)
ddcommon-ffi	74.15% <ø> (ø)
ddtelemetry	59.37% <ø> (ø)
ipc	84.66% <ø> (ø)
profiling	78.63% <ø> (ø)
profiling-ffi	58.19% <ø> (ø)
serverless	0.00% <ø> (ø)
sidecar	36.19% <ø> (ø)
sidecar-ffi	0.00% <ø> (ø)
spawn-worker	54.98% <ø> (ø)
trace-mini-agent	69.70% <ø> (ø)
trace-normalization	97.79% <ø> (ø)
trace-obfuscation	95.75% <ø> (ø)
trace-protobuf	77.16% <ø> (ø)
trace-utils	91.21% <ø> (ø)