Add script to automatically minimize pragma

[Amxx]

Follow up to #5730, Replaces #5649

This adds a scripts that finds the minimal pragma that can be used for a given file.

Usage:

npm run pragma # minimize pragma for all solidity files in contracts/ (mocks excluded)
npm run pragma -- -p 'contracts/accounts/**/*.sol' # minimize pragma for a given subfolder
npm run pragma -- -p 'contracts/utils/Address.sol' # minimize pragma for a given file

Running this script is slow, and should probably not be run in CI. It should be a maintenance operation run every now and then. The pragma validity check (yarn test:pragma) already verifies that the pragma are valid.

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Latest commit: d1c964d

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[arr00]

Why are we updating mocks? Aren't they skipped by default?

[Amxx]

Why are we updating mocks? Aren't they skipped by default?

They are, but just for fun I did run the script on the mocks, and it found two things.

I said "why not" update that ... but if you prefer we can dismiss that.

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The thing is, mocks include mocks/docs ... and maybe these should be processed.