feat: verify contracts deployed from infra

[paulbalaji]

resolves https://github.com/hyperlane-xyz/issues/issues/1033

• use standard input json instead of flattened source in verify script
• remove flatten script
• unify hardhat config formats
• drive-by lint fix
• drive-by helloworld verification.json fix

Follow-up:

• feat: verify with deployment #3255

[changeset-bot]

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Latest commit: 69e1cbb

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[codecov]

Codecov Report

Merging #3243 (69e1cbb) into main (e6e7de8) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3243   +/-   ##
=======================================
  Coverage   67.65%   67.65%           
=======================================
  Files          99       99           
  Lines        1014     1014           
  Branches      106      106           
=======================================
  Hits          686      686           
  Misses        284      284           
  Partials       44       44           

Components	Coverage Δ
core	50.00% <ø> (ø)
hooks	68.79% <ø> (ø)
isms	65.94% <ø> (ø)
token	58.41% <ø> (ø)
middlewares	81.46% <ø> (ø)

[jmrossy]

I've reviewed the SDK portion. Not very familiar with the infra artifact management so you may want another approval for that. Left some optional comments but mostly lgtm