misc: removed float, int, uint

[baszalmstra]

This PR removes the int, uint and float types.

These types are superseded by the concrete types i32, u32 and f64 types. Initially, we felt that people don't care about bitness but we came to the conclusion that we needed to implement sized types as well. Once those were in place we found that the float, int, uint types were verbose and no longer required.

There is a seperate PR to remove them from the book.

[codecov]

Codecov Report

Merging #157 into master will decrease coverage by 0.05%.
The diff coverage is 81.57%.

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
- Coverage   82.74%   82.69%   -0.06%     
==========================================
  Files         162      162              
  Lines       11137    11115      -22     
==========================================
- Hits         9215     9191      -24     
- Misses       1922     1924       +2     

Impacted Files	Coverage Δ
crates/mun_codegen/src/ir/body.rs	84.80% <ø> (ø)
crates/mun_codegen/src/ir/ty.rs	100.00% <ø> (ø)
crates/mun_codegen/src/test.rs	98.11% <ø> (ø)
crates/mun_compiler/src/diagnostics.rs	93.26% <ø> (ø)
crates/mun_hir/src/builtin_type.rs	51.06% <ø> (+0.12%)	⬆️
crates/mun_hir/src/expr.rs	88.43% <ø> (-0.27%)	⬇️
crates/mun_hir/src/tests.rs	84.61% <ø> (ø)
crates/mun_hir/src/ty/primitives.rs	63.63% <ø> (+0.25%)	⬆️
crates/mun_hir/src/ty/resolve.rs	62.50% <ø> (-15.28%)	⬇️
crates/mun_hir/src/ty/tests.rs	96.29% <ø> (ø)
... and 16 more

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