Save statement implementation

[ascandone]

TODOs:

• parse "save" syntax
• handle statement in interpreter
• handle statement in static analysis

[codecov]

Codecov Report

Attention: Patch coverage is 88.57868% with 45 lines in your changes missing coverage. Please review.

Project coverage is 63.09%. Comparing base (db8980f) to head (d68e701).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/parser/antlr/numscript_parser.go	86.48%	18 Missing and 2 partials ⚠️
internal/interpreter/interpreter.go	75.00%	9 Missing and 3 partials ⚠️
internal/interpreter/batch_balances_query.go	64.70%	4 Missing and 2 partials ⚠️
internal/analysis/hover.go	77.77%	3 Missing and 1 partial ⚠️
internal/parser/antlr/numscript_base_listener.go	0.00%	2 Missing ⚠️
internal/parser/ast.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   62.83%   63.09%   +0.26%     
==========================================
  Files          28       28              
  Lines        6024     6176     +152     
==========================================
+ Hits         3785     3897     +112     
- Misses       2079     2112      +33     
- Partials      160      167       +7     

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[ascandone]

Adding @altitude and @gfyrag as reviewers because, even though the PR is in still draft, the next part of the PR won't change the currently commited code