[FEATURE REQUEST] Add support for staking via controller accounts

[sahilnanda1995]

Pointing out all the cases that needs to be handled:

• users connecting to YieldScan via stashId: currently users connecting via stashId with different controller accounts are asked to sign the transaction via stash account which leads to an error on chain, instead they should be asked to sign via controller account, also we need to take into account the fees from where it will be deducted.
• users connecting to YieldScan via controllerId: this is a bit tricky for this we need display info for controlled accounts and similarly sign the transaction as mentioned in above case,
• users connecting to YieldScan via hardware wallets: this is a bigger issue and will need much more involvement and discussion before proceeding to solve it