Add parachain staking panel

[fgamundi]

Staking page for parachains that uses pallet parachainStaking, inspired by the relay chain panel for staking. Allows users to participate in staking by delegating funds to collator candidates. Users can also manage active delegations.

Replaces #6430

List of available information and actions (extrinsics used are in parenthesis):

• Summary view
  • active collators
  • waiting
  • active / delegators
  • total staked by selected candidates
  • inflation
  • % of inflation for parachain rent
  • % collator commission
  • current round number
  • round view
• Collator candidates list
  • address
  • counted delegated stake
  • total delegated stake
  • number of delegators
  • own stake
  • min contribution
  • delegate (delegate)
• Account delegations
  • address
  • delegation amount
  • bond more (delegator_bond_more)
  • schedule bond less (schedule_delegator_bond_less)
  • schedule revoke (schedule_revoke_delegation)
  • execute scheduled action (execute_delegation_request)
  • cancel scheduled action (cancel_delegation_request)