Adds @addresses/dependencies.ts which documents the following:

• FIPs affecting a given contract
• contracts affecting each other
• external dependencies

these are used in @test/integration/dependencies.ts which tests:

• all contracts changed in a fip are in the dependencies log, and signed off
• all dependencies logged are bidirectional

"signed off" means that a developer intentionally adds a flag to the dependencies file saying they checked the contract and any effects of the FIP.

Adds more types and changes several files from json to ts including:

• proposals descriptions
• proposals_config

A future PR will get the contract dependencies up to state of truth