feat(node): Add more detailed OTEL docs

[mydea]

This PR extracts the OTEL docs for node out, which used to be nested under "Set Up Tracing > Instrumentation > OpenTelemetry Support", and put it on the top level (TBD - is there a better place for this?)

In addition, it splits this out into dedicated pages explaining how to do different things.

The following docs already existed, and are now split out:

• Using a custom sampler
• Using a custom setup
• Using an otel tracer
• Using custom otel instrumentation

I also added two more:

• Accessing the tracer provider
• Required OTEL instrumentation (explaining that you need http integration, for example) - related to this, also extended the http integration docs to show newly added options for config there.

For discussion

• Where do we place this? I put it on the top level for now, to make it more explorable, but open for other suggestions.
• For now, I included "OpenTelemetry..." in all the sub page titles. This makes it explicit and searchable, but is maybe a bit redundant - e.g. "Using a Custom OpenTelemetry Sampler" vs "Using a Custom Sampler"

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[codecov]

Bundle Report

Changes will increase total bundle size by 38.2kB ⬆️

Bundle name	Size	Change
sentry-docs-server	8.29MB	38.07kB ⬆️
sentry-docs-edge-server	252.74kB	137 bytes ⬆️
sentry-docs-client	6.24MB	6 bytes ⬇️

[chargome]

I think that's really good!

We have just created a few 404s with this change, but that means the linter works fine ;)

[s1gr1d]

Thanks for adding this!

[Lms24]

Just some rewording suggestions. Otherwise this looks good to me!

[Lms24]

Thanks for rewording. It's more clear to me now.

[lizokm]

Thanks so much for making these updates! I think the flow is much easier to digest. I love the split into "using an existing setup" vs "using an API" <3