[Http Client] Client resolution

[joheredi]

This PR promotes the core client resolution logic from TCGC into @typespec/http-client. I have added a docs section under packages/http-client/docs with conceptual descriptions of the algorithms used for calculation (based on TCGC docs) and practical how-to showing how to use the new APIs

This PR includes:

• Client Detection
  • Implicit detection
  • Explicit @client
• Client Initialization
  • Implicit initialization
• Method Detection
  • Implicit method detection
• Type detection - Collect all types to be emitted
• Porting JS Client emitter to use the new APIs

Follow up work:

• @clientName
• Anonymous Type Name Calculation

[github-actions]

❌ There is undocummented changes. Run chronus add to add a changeset or click here.

The following packages have changes but are not documented.

• ❌@typespec/http-client-js
• ❌@typespec/http-client

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[azure-sdk]

You can try these changes here

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