Refactor Payment PR 1

[ziggie1984]

This PR is the start of a refactor series to finally support both payment backends out of the box for LND.

This PR starts with unifying the PaymentDB code which is currently splitted across multiple files and introducing a new KVPaymentDB struct at the server level. Apart from the second commit which adds a new DB to the server level (but does not use it yet) all of the changes are only refactors so nothing changed.

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[lightninglabs-deploy]

@yyforyongyu: review reminder
@ziggie1984, remember to re-request review from reviewers when ready

[yyforyongyu]

Pretty clean and straightforward! Can you confirm the itest failure is pre-existing? Guess it's related to #9912.

[ellemouton]

🫡

[ellemouton]

ah, actually, quick question: should we not instead rename the test file s.t. it doesnt include 'kv' in the name? cause wont we want to run the unit tests against all backend types depending on build flags (like is done in graph/db/graph_test.go)?

[ziggie1984]

ah, actually, quick question: should we not instead rename the test file s.t. it doesnt include 'kv' in the name? cause wont we want to run the unit tests against all backend types depending on build flags (like is done in graph/db/graph_test.go)?

yes we will run them against the interface backend, but this will be part of a future commit. So we will move all tests which can run against all backends into a separate file in the paymentsDB package which will be introduced later.

[ellemouton]

@ziggie1984 - cool, sgtm 👍