feat: infer self & Self HIR types

[Wodann]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.08130% with 49 lines in your changes missing coverage. Please review.

Project coverage is 87.30%. Comparing base (b68a952) to head (0154148).
Report is 4 commits behind head on main.

Files	Patch %	Lines
crates/mun_hir/src/item_tree.rs	38.88%	11 Missing ⚠️
crates/mun_hir/src/resolve.rs	76.08%	11 Missing ⚠️
crates/mun_hir/src/ty/infer.rs	41.66%	7 Missing ⚠️
crates/mun_hir/src/semantics.rs	0.00%	5 Missing ⚠️
crates/mun_hir/src/item_tree/pretty.rs	66.66%	3 Missing ⚠️
crates/mun_language_server/src/to_lsp.rs	25.00%	3 Missing ⚠️
crates/mun_codegen/src/ir/body.rs	0.00%	2 Missing ⚠️
crates/mun_hir/src/name.rs	0.00%	2 Missing ⚠️
crates/mun_language_server/src/completion/item.rs	0.00%	2 Missing ⚠️
crates/mun_hir/src/expr.rs	93.75%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #564    +/-   ##
========================================
  Coverage   87.30%   87.30%            
========================================
  Files         276      274     -2     
  Lines       32035    32543   +508     
========================================
+ Hits        27968    28413   +445     
- Misses       4067     4130    +63     

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