Feat improve bech32 perf

[remybar]

Related to #74.

This PR uses Cairo 2.7.0 so it depends on the PR #296 (which is blocked until snfoundry has been updated to work with Cairo 2.7.0).

Proposed optimizations:

• use a const fixed-size array for alphabet,
• direct conversion from ByteArray to 5-bits chunks,
• use for in loop in encode,
• avoid creating temporary arrays,
• hardcode generator loop in polymod,
• avoid using shr in polymod,
• call polymod directly, without intermediate arrays.

Note that all modifications have been done in bech32.cairo. The other modifications come from the PR #296.

[vercel]

@remybar is attempting to deploy a commit to the keep-starknet-strange Team on Vercel.

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[remybar]

Hi @maciejka !

This project looks like paused. Is it useful that I continue on the bump to Cairo 2.7 (#296) and to this PR ?

[maciejka]

Hi @maciejka !

This project looks like paused. Is it useful that I continue on the bump to Cairo 2.7 (#296) and to this PR ?

'Paused' is a right word.

[remybar]

Hi @maciejka !
This project looks like paused. Is it useful that I continue on the bump to Cairo 2.7 (#296) and to this PR ?

'Paused' is a right word.

Oh ok 😕 Thanks for your feedback and for the reward on OnlyDust ;-)