Identity proofs

[shjortConcordium]

Purpose

Support identity proofs.
This can be tested with the proof explorer (Currently one needs to use the enable-wallet-connect branch):
https://github.com/Concordium/concordium-web3id/tree/enable-wallet-connect/test-tools/proof-explorer

Known missing stuff:

• Reject web3Id proofs nicely.
• Reject proofs with "incompatible identity providers".
• Reject "Unacceptable requests", like using the same attribute twice in the same credential statement.
• Fix crash when clicking outside bottom sheet during account selection.
• Sometimes between requests, the index does not reset. (So a new request doesn't start on the first statement)
  (All of these will be fixed in a later PR)

This have been added

Changes

• Update Gradle
• Add Concordium-android-sdk and jackson as dependencies.
• Refactoring in IdentityAttributeConverterUtil
• Added support for Identity proofs

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[Radiokot]

Please, check out the comments.
I've also found the following issues when testing the feature locally:

1. When account selector is opened for ID proof and you dismiss the sheet by swiping it down, "Could not send response" message is shown instead of rejecting the request;
   1.1 When account selector is opened for ID proof and you press Back button (or gesture), session proposal is opened instead returning to the ID proof;
2. When I click "Approve" there is a delay before closing the sheet (global params are loading). If the params are not to be changed during request review, I think it is better to load them prior to showing the request, as it is done for smart contract calls;
3. Not sure if it is a proof checker or the app issue, but if I select that only Notabene and DTS are allowed, the request can be proved with Concordium testnet IP anyway;

[shjortConcordium]

Please, check out the comments. I've also found the following issues when testing the feature locally:

1. When account selector is opened for ID proof and you dismiss the sheet by swiping it down, "Could not send response" message is shown instead of rejecting the request;
   1.1 When account selector is opened for ID proof and you press Back button (or gesture), session proposal is opened instead returning to the ID proof;

2. When I click "Approve" there is a delay before closing the sheet (global params are loading). If the params are not to be changed during request review, I think it is better to load them prior to showing the request, as it is done for smart contract calls;

3. Not sure if it is a proof checker or the app issue, but if I select that only Notabene and DTS are allowed, the request can be proved with Concordium testnet IP anyway;

1. This should be fixed now. 👍
   1.1 Good catch, should also be fixed now 👍
2. I think the delay is mostly from the proof being constructed, unless I'm mistaken/misunderstanding. 🤔
3. It is an app issue, should be fixed now. (A "special view" is added if you none, if you have some accounts with the correct issuers, the ones with the "wrong" issuers are filtered out). 👍

[shjortConcordium]

Note that Jakob changed the wallet connect method name, so if you pull this, you also need to pull in the web3-id repo, for the proof explorer to keep working.