Enc: Add more convenient method to start child span.

[maciejwalkowiak]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Add more convenient method to start child span.

💡 Motivation and Context

getsentry/sentry-docs#2715 (comment)

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing
• No breaking changes

🔮 Next steps

[marandaneto]

LGTM

[codecov-io]

Codecov Report

Merging #1073 (749ad1d) into main (d2ebce9) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1073      +/-   ##
============================================
+ Coverage     73.17%   73.21%   +0.04%     
- Complexity     1542     1545       +3     
============================================
  Files           162      162              
  Lines          5510     5519       +9     
  Branches        562      562              
============================================
+ Hits           4032     4041       +9     
  Misses         1189     1189              
  Partials        289      289              

Impacted Files	Coverage Δ	Complexity Δ
...try/src/main/java/io/sentry/SentryTransaction.java	93.84% <100.00%> (+0.86%)	28.00 <2.00> (+2.00)
sentry/src/main/java/io/sentry/Span.java	93.75% <100.00%> (+0.41%)	11.00 <1.00> (+1.00)

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