Add code hash database

[Robbepop]

The Canvas UI should have a feature to query the code hashes that have been deployed on-chain to simplify reuse. It shall be possible to query them by their name as well as by the account ID that uploaded them to the chain.

This UI shall display general information about the code hash as well as its dependencies and dependency count to quickly determine which ones should and should not be reused. Also they should allow inspection into their underlying Wasm sources easily and if provided the associated metadata and therefore contract interface.

It should be very simple for users to instantiate a contract from a selected code hash.