refactor(python): Deprecate serialize json for LazyFrame

[ritchie46]

Doesn't need to be human readable. Especially since json cannot support all our state, so this may not round-trip. Also want to remove it, so I can drop the serde proc macro's on our DSL.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.20%. Comparing base (4f5febe) to head (fa9d3f9).
Report is 36 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18283   +/-   ##
=======================================
  Coverage   80.19%   80.20%           
=======================================
  Files        1501     1501           
  Lines      198908   198911    +3     
  Branches     2837     2837           
=======================================
+ Hits       159522   159543   +21     
+ Misses      38858    38840   -18     
  Partials      528      528           

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