Add some more parsing around classes

[lnihlen]

No description provided.

[codecov]

Codecov Report

Merging #152 (3268cc9) into main (53271b7) will decrease coverage by 4.07%.
The diff coverage is 28.02%.

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
- Coverage   65.71%   61.65%   -4.07%     
==========================================
  Files          12       23      +11     
  Lines         983     1090     +107     
==========================================
+ Hits          646      672      +26     
- Misses        337      418      +81     

Files	Coverage Δ
lang/src/toolchain/parser/node.rs	100.00% <ø> (ø)
lang/src/toolchain/parser/tree/handle_class_def.rs	100.00% <100.00%> (+69.17%)	⬆️
lang/src/toolchain/parser/tree/handle_const_def.rs	0.00% <0.00%> (ø)
...c/toolchain/parser/tree/handle_interpreter_code.rs	0.00% <0.00%> (ø)
...src/toolchain/parser/tree/handle_member_var_def.rs	0.00% <0.00%> (ø)
...ang/src/toolchain/parser/tree/handle_method_def.rs	0.00% <0.00%> (ø)
lang/src/toolchain/parser/tree/handle_name.rs	0.00% <0.00%> (ø)
...ng/src/toolchain/diagnostics/diagnostic_emitter.rs	16.47% <0.00%> (+0.74%)	⬆️
lang/src/toolchain/diagnostics/diagnostic_kind.rs	0.00% <0.00%> (ø)
.../src/toolchain/parser/tree/handle_class_var_def.rs	0.00% <0.00%> (ø)
... and 10 more

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