Add rate limit and timeout handling for Polygon.io API

[matvix90]

Description:
Current Polygon API usage lacks centralized rate-limiting and request timeout handling; this can cause failures or throttling.

Solution:
Implement a request wrapper that:

• enforces retry/backoff on 429 responses,
• sets per-request timeouts,
• logs and surfaces rate-limit headers.

Acceptance criteria:

• All Polygon API calls use the new wrapper.
• Requests have a configurable timeout (default 10s).
• 429 responses trigger exponential backoff with max retries (configurable).
• Rate-limit and retry events are logged.

[Jasonwill2004]

can you assign this to me?

[matvix90]

@Jasonwill2004 yes, let me know how you want to address this issue!

[Jasonwill2004]

@matvix90
The approach that i use is to ,
Implement a centralized Polygon request wrapper that:
Enforces per-request timeout (default 10s, POLYGON_REQUEST_TIMEOUT)
Retries on 429 with exponential backoff (default 3, POLYGON_MAX_RETRIES)
Extracts/logs rate-limit headers (get_last_rate_limit_headers())
Add unit tests that mock RESTClient.get_aggs to validate retry + timeout behavior.

[Jasonwill2004]

@matvix90 i have raised a PR please review and merge it as well