Increase the number of collator seats to 30.

Nova Wallet is a mobile app for the Polkadot and Kusama ecosystem. They have proposed to add more features to the app, such as a Multistaking dashboard, Staking Nomination Pools, WalletConnect v2, and a new Assets tab UI. They also plan to fulfill community requests and reimburse for delivered features. The goal is to build and maintain a high-quality, open-source, community-focused, and feature-rich mobile application.

Dwellir provided decentralized RPC services for Polkadot communities in Q3 2023.

Set the maximum number of collator candidates that can be selected
at the beginning of each validation round.

Changes are not applied until the start of the next round.

The new value must be higher than the minimum allowed as set in the
pallet's configuration.

The dispatch origin must be Root.

Emits `MaxSelectedCandidatesSet`.


# <weight>
- The transaction's complexity is mainly dependent on updating the
  `SelectedCandidates` storage in `select_top_candidates` which in
  return depends on the number of `MaxSelectedCandidates` (N).
- For each N, we read `CollatorState` from the storage.
---------
Weight: O(N) where N is `MaxSelectedCandidates` bounded by
`MaxTopCandidates`
- Reads: MaxSelectedCandidates, TopCandidates, N * CollatorState
- Writes: MaxSelectedCandidates
# </weight>

- They want to increase the number of collator seats to 30.
- This will help with the security and efficiency of the network.
- More collator seats means more people can help validate transactions.
- It will also make it easier for new projects to join the network.
- People can vote on whether or not they want to increase the collator seats.

#8 Increase to 30 Collators

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