fix[codegen]: fix transient codegen for slice and extract32

[cyberthirst]

What I did

• fix for: incorrect transient storage codegen for extract32() and slice() #3801

How I did it

• check location for word_addressable and the usage of generic load ops

How to verify it

Commit message

this commit fixes transient storage codegen for `slice()` and
`extract32()` builtins. previously, some codegen routines were hardcoded
to check for storage; this commit changes them to check if they are
`word_addressable` instead. this commit also refactors the `extract32()`
code generation logic to be simpler and use more recent APIs. the new
implementation relies on the optimizer to do some optimizations which in
this routine were previously hand-rolled.

Description for the changelog

Cute Animal Picture

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.79%. Comparing base (ee11e3d) to head (af0e811).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3874      +/-   ##
==========================================
- Coverage   90.91%   90.79%   -0.12%     
==========================================
  Files          95       95              
  Lines       14401    14411      +10     
  Branches     3186     3189       +3     
==========================================
- Hits        13093    13085       -8     
- Misses        908      924      +16     
- Partials      400      402       +2     

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