feat: optimize literal bytestrings

[charles-cooper]

What I did

per title

depends on data directives introduced in #3496 .

How I did it

How to verify it

Commit message

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Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #3501 (35bc569) into master (4ca1c81) will decrease coverage by 31.60%.
The diff coverage is 55.34%.

❗ Current head 35bc569 differs from pull request most recent head 0bbe34d. Consider uploading reports for the commit 0bbe34d to get more accurate results

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@@             Coverage Diff             @@
##           master    #3501       +/-   ##
===========================================
- Coverage   89.19%   57.60%   -31.60%     
===========================================
  Files          84       85        +1     
  Lines       10979    11299      +320     
  Branches     2507     2570       +63     
===========================================
- Hits         9793     6509     -3284     
- Misses        774     4161     +3387     
- Partials      412      629      +217     

Files Changed	Coverage Δ
vyper/cli/vyper_compile.py	16.21% <0.00%> (-47.98%)	⬇️
vyper/codegen/core.py	54.41% <ø> (-32.81%)	⬇️
vyper/compiler/output.py	34.19% <0.00%> (-57.47%)	⬇️
vyper/utils.py	71.28% <ø> (-12.88%)	⬇️
vyper/codegen/module.py	46.66% <41.80%> (-50.96%)	⬇️
vyper/codegen/jumptable_utils.py	41.86% <41.86%> (ø)
vyper/ir/compile_ir.py	75.62% <74.13%> (-18.14%)	⬇️
.../codegen/function_definitions/external_function.py	68.18% <83.33%> (-31.82%)	⬇️
vyper/codegen/expr.py	50.11% <100.00%> (-37.07%)	⬇️
vyper/codegen/function_definitions/__init__.py	100.00% <100.00%> (ø)
... and 2 more

... and 57 files with indirect coverage changes

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