Toufeeq/polkadot v1.16.2

[ToufeeqP]

Companions:
avail-core: PR #112
polkadot-sdk: PR #21
try-runtime-cli: PR #1

TODO:

• Make try-runtime cli tool compatible with avail
• Fix releaser
• Update weights by running benchmarks on the reference machine

Notable changes:

• Moved to WasmExecutor
• Removed try-runtime subcommand from the node
• Enforce network key presence on authority nodes
• Changed validator disable strategy on offences, no more than 1/3 of the active set validators can be disabled (migration)
• Integrated litep2p into backend, the --network-backend option can be used to switch between libp2p & litep2p backends
• Allows Nomination Pool to use different staking strategies including a new DelegateStake strategy