chore: rename InvocableScripts to InvokableScripts

[bednar]

Related to influxdata/openapi#317

Proposed Changes

Renamed InvocableScripts to InvokableScripts.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• rake test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #103 (4ee7248) into master (ddc260b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   50.25%   50.25%           
=======================================
  Files          63       63           
  Lines        6395     6395           
=======================================
  Hits         3214     3214           
  Misses       3181     3181           

Impacted Files	Coverage Δ
lib/influxdb2/client/flux_csv_parser.rb	100.00% <ø> (ø)
lib/influxdb-client.rb	100.00% <100.00%> (ø)
lib/influxdb2/client/client.rb	100.00% <100.00%> (ø)
lib/influxdb2/client/invokable_scripts_api.rb	36.36% <100.00%> (ø)

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