feat: Add request_timeout, a parameter as optional to cluster::request() which allows user to set http_client::timeout and add error message for request timeouts

[sony-string]

At now, cluster::request can't accept HTTP requests that require a long time to wait for response, especially which takes over 5 seconds. That's because there's no option to set http_client::timeout as user want. So, I added the optional parameter request_timeout to set it.

When an user calls cluster::request(), It would be passed through cluster::request() -> http_request::request_timeout (what I added in this commit) -> http_client::timeout

And also, http_request::run is printing Malformed HTTP response when request has timed out, so I fix it to print a log "Timed out while waiting for the response". For this, I needed to add a public member variable to http_client, timed_out which would be set by https_client::one_second_timer()

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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