fix: use GET requests when using CQL2 STAC filters

[jverrydt]

• Removed filter_lang STAC query param as we only support cql2 text format
• Use GET request when CQL2 filter is passed because STAC API filter extension does not support this for POST requests yet

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.85%. Comparing base (161916b) to head (506bacb).
Report is 6 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   81.85%   81.85%           
=======================================
  Files          13       13           
  Lines         854      854           
  Branches      103      103           
=======================================
  Hits          699      699           
  Misses        103      103           
  Partials       52       52           

Flag	Coverage Δ
unittests	81.85% <ø> (ø)

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