ddtrace/tracer: add uptrace/bun to telemetry's supported contribs

[darccio]

What does this PR do?

Adds uptrace/bun to our telemetry's supported contribs list.

Motivation

Making sure the integration is reported as imported when it's in use.

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: 2024-08-07 08:53:54

Comparing candidate commit 123aa69 in PR branch dario.castane/bun-telemetry with baseline commit 6674e13 in branch main.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 58 metrics, 0 unstable metrics.

scenario:BenchmarkSetTagString-24

• 🟩 execution_time [-5.456ns; -2.784ns] or [-4.667%; -2.381%]