Adds a bunch of primitive types.

[baszalmstra]

Adds primitive types: i8, i16, i32, i64, isize, int, u8, u16, u32, u64, usize, uint, f32, f64, float.

There is no conversion between them. This should be implemented in a separate PR.

[codecov]

Codecov Report

Merging #95 into master will decrease coverage by 0.71%.
The diff coverage is 44.03%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
- Coverage   76.82%   76.11%   -0.72%     
==========================================
  Files         122      124       +2     
  Lines        9601     9795     +194     
==========================================
+ Hits         7376     7455      +79     
- Misses       2225     2340     +115     

Impacted Files	Coverage Δ
crates/mun_hir/src/ty/infer/coerce.rs	100.00% <0.00%> (ø)
crates/mun_hir/src/builtin_type.rs	19.29% <0.00%> (ø)
crates/mun_hir/src/ty/primitives.rs	39.81% <0.00%> (ø)
crates/mun_hir/src/code_model.rs	75.91% <0.00%> (+1.12%)	⬆️

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[Wodann]

Add i32, f32, etc, etc types

[baszalmstra]

Closing this in favor of #96