Tracking: Use Solar for Solidity AST

[DaniPopes]

Component

Other (please describe)

Describe the feature you would like

Replace solang-parser and solc AST usage with Solar.

Part 1 of the migration to Solar. See the blog post for more details.

Additional context

No response

[MathisGD]

Hey @DaniPopes! When do you plan to do the refactor for fmt? Otherwise do you think that this could be a first good issue?

Note that fmt stills breaks with the transient keyword (see #9088).

[zerosnacks]

Hi @MathisGD, it is currently part of our 1.1 milestone and in focus - fmt is quite large / complex unfortunately, I wouldn't consider it a good first issue. In the meantime I'm still trying to get solang to support the transient keyword to unblock this for our users, see: hyperledger-solang/solang#1670 (comment). An additional comment underscoring this is a blocker for you may help.

cc @grandizzy