LS: Project model - initial struct

[piotmag769]

Stack:

• LS: Send project model updates through channel #6734
• LS: Project model - initial struct #6718 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[reviewable-StarkWare]

This change is 

[mkaput]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Arcticae, @Draggu, @integraledelebesgue, and @orizi)

[Draggu]

Reviewed 3 of 5 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Arcticae, @integraledelebesgue, and @orizi)