v2: create godoc for contribs

[hannahkm]

What does this PR do?

Add a godoc page for the contribs folder.

Motivation

The current version of the v2.0.0 godoc page does not have a page for contribs. We should have one to simplify linking between pages and for isolating contrib docs to one page.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-07 14:18:58

Comparing candidate commit 1dd4cb1 in PR branch hannah/contrib-doc with baseline commit 7d4b68c in branch hannah/divergences.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 53 metrics, 0 unstable metrics.

[hannahkm]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in hannah/divergences is 0s.

Use /merge -c to cancel this operation!