Move the account signing methods from Vuex to composable

[olszewskimar]

https://aeternity-blockchain.atlassian.net/browse/SW-1378

[Liubov-crypto]

During my testing I've constantly got this issue in console, and I think it might be affect all errors that I listed below:

Error: pubkey cannot be null or undefined.

1. Can't send ae and Fungible tokens:
2. Verify an amount and Max button isn't working for FT:

https://github.com/superhero-com/superhero-wallet/assets/69896204/d5f810e3-e958-43ed-a1cb-6ff8d2b44828

3. Set name pointer:

4. Register a name:

5. Multisig creation

6. Generate Gift card

7. Bid on name

8. Transactions on DEX:

9. Interactions with superhero.com - I can connect my wallet but there is no popup for signing Txs and I can't perform any Transaction.

10. For some reason I can't see my multisig vaults on both networks (I can see them on develop branch).

@peronczyk please check it.

[peronczyk]

@Liubov-crypto I updated the PR with some fixes. Can you please see if all problems are fixed?

[Liubov-crypto]

Sometimes I get an error with multisig creation when I'm using 2nd account or 3,4,5 accounts as 1st Signer (this issue isn't reproducible on dev):

@peronczyk could you please check it?

The rest issues have been fixed.

[Liubov-crypto]

Now the issue with multisig creation is happening on dev too. We already have such issue in our backlog. I think we can proceed with this PR or should I recheck it again?

[Liubov-crypto]

I have retested and issue with multisig is reproducible again in the testnet. maybe I have to wait until backend will work properly and then recheck it again.

[Liubov-crypto]

It works with new wallets. I do confirm that the issue has been fixed.