Auto load wallet on start up if available

[napoly]

This PR was created after extensive discussions with @deverickapollo and is partially influenced by the following pull requests:

• Add wallet management via ui #58
• Add wallet file exists test with Db clean up #62

The primary goal of this change is to streamline our deployment process and minimize friction when moving to production.

Changes included in this PR:

• Deprecates wallet passwords due to the inability to fully separate the password file from the wallet file.
• Renames MoneroRPCProvider to MoneroRpcProvider for consistency.
• Adds automatic wallet migration and load-up when the wallet is successfully found, with integration tests.
• Reverts the view_wallet name back to wallet to simplify migration.
• Introduces some helper functions for testing in IntegrationTestUtils.
• Updates the btcpayserver submodule.
• Requires a follow-up change in the btcpayserver-docker PR #1035
  to migrate from --wallet-file=/wallet/wallet --password-file=/wallet/password to --wallet-dir=/wallet.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +1.00% (target: -1.00%)	✅ 89.29%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e17d930)	979	563	57.51%
Head commit (a3f5d30)	993 (+14)	581 (+18)	58.51% (+1.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#65)	56	50	89.29%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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