FeSized trait and data opertions.

[g-r-a-n-t]

What was wrong?

Partially addresses #19 and something that was mentioned in #39.

There are still some things that need to be refactored, but for the sake of keeping this PR at a reasonable size, they were ignored. The best example of this is that we still use methods defined within our types module to form Yul expressions and statements. These Yul elements should instead be formed exclusively in the mapper pass.

How was it fixed?

Created a new FeSized trait that is analogous to Rust's very own Sized trait, then used this trait to implement a set of data operations and refactored the compiler to use these operations.

To-Do

• OPTIONAL: Update Spec if applicable
• Clean up commit history

[codecov-io]

Codecov Report

Merging #93 into master will increase coverage by 0.03%.
The diff coverage is 62.85%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   87.67%   87.71%   +0.03%     
==========================================
  Files          37       37              
  Lines        2296     2287       -9     
==========================================
- Hits         2013     2006       -7     
+ Misses        283      281       -2     

Impacted Files	Coverage Δ
compiler/src/yul/mappers/declarations.rs	100.00% <ø> (ø)
compiler/src/yul/mappers/functions.rs	0.00% <ø> (ø)
compiler/src/yul/mappers/assignments.rs	88.37% <44.44%> (-11.63%)	⬇️
compiler/src/yul/mappers/operations.rs	66.66% <62.50%> (-33.34%)	⬇️
semantics/src/namespace/types.rs	46.23% <66.66%> (-3.37%)	⬇️
compiler/src/yul/mappers/expressions.rs	96.59% <85.71%> (+0.07%)	⬆️

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[cburgdorf]

LGTM