Add standard to development guide

[p-datadog]

What does this PR do?
Adds a mention of standard to the development guide, used currently for profiling and DI.

Motivation:
Improving developer experience

Change log entry
None

Additional Notes:

How to test the change?

N/A

[datadog-datadog-prod-us1]

Datadog Report

Branch report: standard-dev-guide
Commit report: c36eda7
Test service: dd-trace-rb

✅ 0 Failed, 22140 Passed, 1471 Skipped, 6m 17.12s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-03 10:27:40

Comparing candidate commit c36eda7 in PR branch standard-dev-guide with baseline commit b1400d5 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[ivoanjo]

👍 LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.75%. Comparing base (b1400d5) to head (c36eda7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4242      +/-   ##
==========================================
- Coverage   97.76%   97.75%   -0.01%     
==========================================
  Files        1353     1353              
  Lines       82392    82392              
  Branches     4224     4224              
==========================================
- Hits        80550    80543       -7     
- Misses       1842     1849       +7     

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