Fix2308 latest

[mghildiy]

Summary of changes:

• Add query parameter spss to API /api/search in http.go
• Update http_test.go for new query parameter
• to set number of spans during filtering
• Update engine_test.go
• Update instance_search_test.go

Adds a query parameter to Search API to make spans-per-span-set in response configurable::

Which issue(s) this PR fixes:
Fixes #2308

Checklist

• [http_test.go, engine_test.go,instance_search_test.go ] Tests updated
• [ docs/sources/tempo/api_docs/_index.md] Documentation added
• [CHANGELOG.md] updated

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1 out of 2 committers have signed the CLA.

✅ mghildiy
❌ manish chandra ghildiyal

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