feat(compiler): Allow renaming imports with qualified names [LNG-361]

[InversionSpaces]

Description

Refactor internal aqua module management.
Allow users redeclare whole modules, e.g.

aqua Lib declares SubLib
use "sublibA" -- brings SubLib.A.* symbols into scope
use "sublibB" -- brings Sublib.B.* symbols into scope

declares all Lib.SubLib.* symbols.
Allow renaming nested symbols when importing, e.g.

aqua Module
-- Brings `Lib.A.Sub.f` into scope as `Lib.B.Another.g`
use A.Sub.f as B.Another.g from "lib"

Allow exporting nested imported symbols, e.g.

aqua Module
-- exports `Lib.Sub.f` as `g`
export Lib.Sub.f as g
-- brings `Lib.Sub.f` into scope
use "lib"

Proposed Changes

• Refactor RawContext handling. Now abilities are "linearized" meaning that ability A.B.C is stored in nested abilities A, B and C. Previously it was stored just under key "A.B.C"
• Accommodate parser to necessary changes

Implementation Details

• SName (simple name, without dots) and PName (path name that may contain dots) are introduced to substitute Strings and tighten typing

Checklist

• Corresponding issue has been created and linked in PR title.
• Proposed changes are covered by tests.
• Documentation has been updated to reflect the changes (if applicable).
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.

[linear]

LNG-361 Implement imports renaming

[DieMyst]

• will be great to add integration test on feature
• tests that this feature is supported by LSP (or just create task)