feat(utils): add rate limiter with token bucket algorithm

[shivv23]

Summary

Add rate limiter using token bucket algorithm.

Why

Cloud providers have rate limits. This prevents hitting them.

What

• Token bucket algorithm for smooth rate limiting
• acquire() - blocks until allowed
• try_acquire() - non-blocking check

Usage

let limiter = RateLimiter::new(10.0);  // 10 req/s

limiter.acquire().await?;  // blocks if needed

Files

• rustcloud/src/utils/rate_limiter.rs

[Sandipmandal25]

same here too the file added in this pr is not declared as a module anywhere in the crate so it is never compiled it is dead code

[Sandipmandal25]

same here too the file added in this pr is not declared as a module anywhere in the crate so it is never compiled it is dead code and has no effect on the library. There are also no CI checks running on this branch so compilation errors would not be caught automatically but you should verify this before opening one more new pr reporting this again . Beyond the wiring issue there is at least one code level bug in this PR that would prevent compilation. Please run cargo build locally and confirm it compiles before marking this ready for review.