[7/?] StaticAddr: Loop-In

[hieblmi]

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This PR introduces loop-ins of static address deposits. The client/server interaction is depicted below:

Open tasks that need resolution until this PR can leave draft mode:

• [x] Refactorings, unify code with reservations/instantout
• [x] DB storage & fsm recovery
• [x] Manual quote acceptance
• [x] FSM transition consistency checks
• [x] unit + integration tests
• [x] signing multiple fee-version htlcs, potential anchor output

Previously merged PRs:

https://github.com/lightninglabs/loop/pull/642 https://github.com/lightninglabs/loop/pull/650 https://github.com/lightninglabs/loop/pull/677 https://github.com/lightninglabs/loop/pull/719 https://github.com/lightninglabs/loop/pull/721 https://github.com/lightninglabs/loop/pull/750

https://github.com/lightninglabs/loop/compare/master...static-addr-staging