Add linter rule for spell address comparison

[KirillDogadin-std]

Closes # .

Checklist:

• issue number linked above after pound (#)
  • replace "Closes " with "Contributes to" or other if this PR does not close the issue
• issue checkboxes are all addressed
• manually checked my feature / not applicable
• wrote tests / not applicable
• attached screenshots / not applicable

[KirillDogadin-std]

Current state summary:

• the rule seems to work when ran locally:
  • tsc && ./bin/lint.js <PATH_PREFIX_DEPENDS_ON_USER>/spells-mainnet/src/DssSpell.sol
  • the spells-mainnet branch is origin/2023-06-28
• idea of the tool:
  • detect the description variable that is mandatory for the spell
  • get the line with the comment above this variable and expect the hash command to be provided there
  • extract the raw gh url from the hash command and download the file to the tempdir of the OS under the predefined / static name.
  • parse the source code to get the AST and find the nodes with addresses: get the list of the addressees.
  • parse the exec document with the regexp to get the addresses' list.
  • convert the lists to sets of lowercase strings - compare the sets
• did not address test / integration at all.
• outstanding points to address:
  • general code polishing and refactoring
  • adding tests
    • not only writing the test is required but also emulating/mocking the presence of the exec doc. Or storing the sample exec doc as test data.
  • fixing ci (if needed)
  • reconsidering the way the exec doc file is stored / handled.
  • looking for a better way to extract the addresses from the exec doc.