feat: add 128-bit integers (i128 and u128)

[wackbyte]

Also includes Runtime::invoke_fn15 and a corresponding extra branch to invoke_fn!.

[wackbyte]

Did I miss anything this time?

[baszalmstra]

Just the one small change.

[codecov]

Codecov Report

Merging #124 into master will decrease coverage by 0.04%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   78.86%   78.81%   -0.05%     
==========================================
  Files         141      141              
  Lines        8728     8739      +11     
==========================================
+ Hits         6883     6888       +5     
- Misses       1845     1851       +6     

Impacted Files	Coverage Δ
crates/mun_codegen/src/ir.rs	43.18% <ø> (ø)
crates/mun_codegen/src/test.rs	97.36% <ø> (ø)
crates/mun_codegen/src/type_info.rs	62.06% <ø> (ø)
crates/mun_hir/src/builtin_type.rs	0.00% <0.00%> (ø)
crates/mun_hir/src/name.rs	70.96% <ø> (ø)
crates/mun_hir/src/ty/tests.rs	96.05% <ø> (ø)
crates/mun_runtime/src/macros.rs	64.91% <ø> (ø)
crates/mun_runtime/src/reflection.rs	55.31% <ø> (ø)
crates/mun_hir/src/ty/primitives.rs	68.00% <50.00%> (-1.57%)	⬇️
crates/mun_codegen/src/ir/ty.rs	100.00% <100.00%> (ø)
... and 2 more

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