feat(client): add session pooling for connection reuse TAV-4105

[tinosattavily]

Summary

• Add requests.Session() to TavilyClient for HTTP connection pooling
• Reuse TCP connections and TLS handshakes across API calls
• Reduces per-request overhead (~100-300ms) for repeated calls
• Add close() method and context manager support for resource cleanup
• Remove deprecated get_company_info() method
• Simplify public methods with direct returns

Test plan

• Verify existing tests pass
• Test multiple sequential API calls show connection reuse
• Confirm no breaking changes to public API

Fixes TAV-4105

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Note

Introduces connection pooling via requests.Session() in TavilyClient, with headers/proxies configured once. Adds close() and context manager support for resource cleanup.

• Switches all HTTP calls in search/extract/crawl/map/research/get_research to self.session and minor refactors (URL/payload vars, timeout clamp)
• Normalizes error handling (spaces in status lists) and ensures safe defaults with setdefault for results/failed_results
• Simplifies wrappers to direct returns (crawl, map, research)
• Removes deprecated get_company_info and unused concurrency import
• Tests: adds MockSession and Interceptor.Session to support session-based requests in tests/request_intercept.py

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