[FEATURE] Type Checking

[SpontanCombust]

Add type checking analysis that will look through code and display errors wherever an unknown or incompatible with a given context symbol is used.
This will also fast-forward the completion of content0_native code-base as we will instantly know which types are missing in entire content0.

Strategy:

• Should only run after explicit file save ("full" diagnostics).
• Should check the current content and all its dependants.

Undecided:

• How to organize diagnostics? Should they all belong to a new domain or could we add some into "Workspace Symbol Analysis" domain? A part that could be done on symbols alone could go to the latter, whereas the first would get diagnostics that can only be performed by traversing ASTs.
• Analysis could be run on ALL scripts of current content and all its dependants, but if the performance will be too poor it will need some optimizations.