feat: add self parameter

[Wodann]

[codecov[bot]]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (55a3412) 87.35% compared to head (322c386) 87.30%.

Files	Patch %	Lines
crates/mun_syntax/src/ast/generated.rs	85.14%	15 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #557      +/-   ##
==========================================
- Coverage   87.35%   87.30%   -0.06%     
==========================================
  Files         276      276              
  Lines       31983    32035      +52     
==========================================
+ Hits        27940    27968      +28     
- Misses       4043     4067      +24     

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