[v0.9.0] Accounts: hardware wallet / external signer support + batching

[kaloudis]

Description

Related issues: ZEUS-942, ZEUS-1121

This PR adds ability to import external accounts to the LND interfaces (embedded, REST, and LNC). With these external accounts, you can send and receive on-chain transactions, craft channel opens with airgapped funds, and observe balances in a watch-only manner.

This PR also adds the ability to send batch txs and batch open channels.

Lastly, this PR also adds the ability for generating and scanning animated QRs using both BC-ur and BBQr formats.

It has been tested against the Coldcard Q and SeedSigner hardware devices. It should work with any external signer, as Coldcard PSBT validation is the strictest we've seen so far - but no promises.

Replaces #726, which was opened almost 2 and a half years ago!

Constraints:

• Remote instances of LND will not be able to sign PSBTs correctly until LND v0.18.0 [bug]: Remote Signer: FundPsbt: change output lacking master fingerprint (XFP) lightningnetwork/lnd#8626
• All instances cannot sign PSBTs on testnet or signet correctly [bug]: Remote Signer: ImportAccount: incorrect coin type in derivation path on testnet lightningnetwork/lnd#8645
• Accounts cannot yet be deleted [feature]: Key Import: add ability to delete accounts lightningnetwork/lnd#8654
• Rescans to detect past events are not supported yet [feature]: Key Import: support rescans to detect past events lightningnetwork/lnd#8655

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Configuration change
• Locales update
• Quality assurance
• Other

Checklist

• I’ve run yarn run tsc and made sure my code compiles correctly
• I’ve run yarn run lint and made sure my code didn’t contain any problematic patterns
• I’ve run yarn run prettier and made sure my code is formatted correctly
• I’ve run yarn run test and made sure all of the tests pass

Testing

If you modified or added a utility file, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms (please specify OS version and phone model/VM):

• Android
• iOS

I have tested this PR with the following types of nodes (please specify node version and API version where appropriate):

• Embedded LND
• LND (REST)
• LND (Lightning Node Connect)
• Core Lightning (c-lightning-REST)
• LndHub
• [DEPRECATED] Core Lightning (Spark)
• [DEPRECATED] Eclair

Locales

• I’ve added new locale text that requires translations
• I’m aware that new translations should be made on the ZEUS Transfix page and not directly to this repo

Third Party Dependencies and Packages

• Contributors will need to run yarn after this PR is merged in
• 3rd party dependencies have been modified:
  • verify that package.json and yarn.lock have been properly updated
  • verify that dependencies are installed for both iOS and Android platforms

Other:

• Changes were made that require an update to the README
• Changes were made that require an update to onboarding