Port "rpc: Add HTTP timeout" (tendermint-rs#1380)

[romac]

Closes: #20

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@03974f5). Click here to learn what that means.

❗ Current head 65de526 differs from pull request most recent head 18b8a3b. Consider uploading reports for the commit 18b8a3b to get more accurate results

Files	Patch %	Lines
rpc/src/client/transport/http.rs	50.0%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             main     #26   +/-   ##
======================================
  Coverage        ?   57.1%           
======================================
  Files           ?     254           
  Lines           ?   27590           
  Branches        ?       0           
======================================
  Hits            ?   15764           
  Misses          ?   11826           
  Partials        ?       0           

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