Total nomination pool members and number of pools have been limited when pools was introduced as a preventive measure against any unforeseen bugs. Since pools has been running for more than 500 days now, I propose to remove these limits.

The number of pool members is also approaching quickly towards the current limit of 49,152 (current count is 44,143 at the time of writing). 

This proposal changes the following values:
- MaxPools => Current value: 512 → New value: None (unlimited)
- MaxPoolMembers => Current value: 49,152 → New value: None (unlimited)

This was also announced previously on [polkadot forum](https://forum.polkadot.network/t/next-revision-of-increasing-nomination-pool-limits/2498/12).

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staking_admin

Nomination Pool: Remove max pool and max member limits

root

whitelisted_caller

wish_for_change

treasurer

lease_admin

fellowship_admin

general_admin

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Origin able to dispatch a whitelisted call.

Origin for signaling that the network wishes for some change

Origin able to cancel slashes and manage minimum commission.

Origin for spending up to 10,000,000 DOT from the treasury as well as generally administering it.

Origin for managing the composition of the fellowship.

Origin able to spend around 250 DOT from the treasury at once.

Origin able to spend around 1,000 DOT from the treasury at once.

Origin able to spend around 10,000 DOT from the treasury at once.

Origin able to spend around 100,000 DOT from the treasury at once.

Origin able to spend up to 1,000,000 DOT from the treasury at once.