feat: improve batch copy performance

[charles-cooper]

per cancun, eip-5656. also add heuristics to use loops vs unrolled loops for batch copies.

bytecode size comes down roughly 2-5%, i checked curve-stablecoin/Stableswap.vy, tricrypto-ng/TriCryptoOptimizedWETH.vy and vaults/VaultV3.vy. there are potentially more places where we could use copy_bytes too

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Commit message

per cancun, eip-5656, this commit adds the use of mcopy for memory
copies. it also
- adds heuristics to use loops vs unrolled loops for batch copies.
- adds helper functions `vyper.codegen.core._opt_[gas,codesize,none]()`
  to detect optimization mode during codegen
- adds `--optimize none` to CLI options, with the intent of phasing out
  `--no-optimize` if the ergonomics are better.

Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #3483 (1c64f2c) into master (593c9b8) will increase coverage by 0.01%.
The diff coverage is 93.18%.

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@@            Coverage Diff             @@
##           master    #3483      +/-   ##
==========================================
+ Coverage   89.17%   89.19%   +0.01%     
==========================================
  Files          84       84              
  Lines       10882    10948      +66     
  Branches     2488     2503      +15     
==========================================
+ Hits         9704     9765      +61     
- Misses        767      771       +4     
- Partials      411      412       +1     

Impacted Files	Coverage Δ
vyper/evm/opcodes.py	100.00% <ø> (ø)
vyper/ir/compile_ir.py	93.76% <ø> (ø)
vyper/codegen/ir_node.py	91.24% <83.33%> (+0.05%)	⬆️
vyper/codegen/core.py	87.41% <93.10%> (+0.47%)	⬆️
vyper/ir/optimizer.py	97.95% <94.44%> (-0.24%)	⬇️
vyper/cli/vyper_compile.py	64.18% <100.00%> (ø)
vyper/compiler/phases.py	92.36% <100.00%> (+0.11%)	⬆️
vyper/utils.py	84.15% <100.00%> (-0.08%)	⬇️

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