feat: Add support for the Ledger Generic App

[bee344]

It adds signsWithMetadata to support the new Polkadot Generic App. It also adds the support to send the signedTransaction back from the extension to the dApp.

Now the option to upload the metadata to the extension also uploads the rawMetadata as a HexString, that's necessary for CheckMetadataHash. The button also remains disabled until the rawMetadata is retrieved from the endpoint, in order to make sure the upload is done correctly.

This replaces #1397 .

Needs to be ran alongside #10778, because that has the support to uploading the metadata to the extension.

EDIT:

• Added an error when trying to sign with a Ledger without the metadata present in the extension.
• Updated the import process, because it broke with the Generic App and you could no longer import Ledger accounts other than Polkadot's.

[TarikGul]

I think we should rework this little portion, when no metadata is present there should be some sort of error that is thrown, and logged on the screen.

[TarikGul]

Maybe we can do an assert here - We just want to make sure the ss58 is always for certain what is present in the ss58 format and can't resolve to 0

[TarikGul]

There are 2 little nits I have - But I also think we should have some way to warn about no metadata being present when users are using their ledger account

[TarikGul]

Also we should consider what the workflow is also going to look like for the migration app.

[TarikGul]

LGTM, great job - this will be followed up with support for the Migration App.

[bee344]

@TarikGul Currently you have to add a new account for every chain, even though the derivation paths are the same, so it's kind of annoying. We could eventually add a "Allow use on any network" option like when creating via mnemonic.

[polkadot-js-bot]

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