feat: add firstTimestamp field to the keyInfo struct.

[temphiza]

Proposed change:

This change adds the field firstTimestamp to the KeyInfo struct, which should be in line with the TS.INFO response of the latest version of the redis-timeseries module.

Testing:

• Tests updated: TestClientInfo, TestAdd, TestAddWithRetention
• Test added: TestClientInfoRange

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (e83b198) 82.74% compared to head (8a77ec6) 82.79%.

❗ Current head 8a77ec6 differs from pull request most recent head 55c21ef. Consider uploading reports for the commit 55c21ef to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   82.74%   82.79%   +0.05%     
==========================================
  Files           7        7              
  Lines         591      593       +2     
==========================================
+ Hits          489      491       +2     
  Misses         59       59              
  Partials       43       43              

Impacted Files	Coverage Δ
common.go	89.74% <ø> (ø)
reply_parser.go	67.23% <100.00%> (+0.37%)	⬆️

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