Proof of Concept Completion

[TorstenStueber]

• [x] Merge deposit PR for full asset support
• [x] Merge Withdrawal PR
• [x] #31
• [x] #32
• [x] #35
• [x] #37
• [x] ~#36~
• [x] #33
• [x] #34
• [x] ~#38~
• [x] https://github.com/pendulum-chain/pendulum-prototype/pull/40
• [x] ~Secure chain extension: don't allow any arbitrary transfer of funds; use an ERC20 like mechanism~ Make clear in docs we're aware, but don't fix
• [x] ~secure chain extension: return a Result<,>~ Make clear in docs we're aware, but don't fix
• [x] ~Use better cache for explorer UI~ Make clear in docs that this is slow (20s+ load times)
• [x] ~Use permanent state for backend~ Make clear in docs that this the system will restart periodically
• [x] ~Deploy backend to permanent system~ Make clear in docs that this the system will restart periodically
• [x] Remove WebSocket rate limit from backend (a lot of 429 responses sent)

[TorstenStueber]

The WebSocket rate limit was actually a rate limit issued by Google Cloud run because the node requires 1.2 CPUs on average and we only provided 1 CPU for the node so that it was always running at limit. I now provided 2 CPUs and it seems to be running smoothly.

[TorstenStueber]

Issue completed!