Fixing #6988

* update bip39 version

* and lock

* client/cli/src/config: Warn on low file descriptor limit

Substrate sets the soft file descriptor limit to the hard limit at
startup. In the case of the latter being low already (< 10_000) a
Substrate node under high demand might run into issues e.g. when opening
up new TCP connections or persisting data to the database.

With this commit a warn message is printed to stderr.

* client/cli/Cargo.toml: Update to fdlimit 0.2.0

* client/*: Treat protocol name as str and not [u8]

Notification protocol names are in practice always valid utf8 strings.
Instead of treating them as such in the type system, thus far they were
casted to a [u8] at creation time.

With this commit protocol names are instead treated as valid utf8
strings throughout the codebase and passed as `Cow<'static, str>`
instead of `Cow<'static, [u8]>`. Among other things this eliminates the
need for string casting when logging.

* client/network: Don't allocate when protocol name is borrowed

* add benchmark for disapprove_proposal

* use generated WeightInfo for pallet-collective weights

* order collective benchmark params alphabetically to get a consistent ordering

* address review comments

* remove default impl of WeightInfo for ()

* remove comments about weight changes

* add default weights

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <[email protected]>

* whitelist voter account in benchmark

* update weights

* MaxMembers configurable

* remove base weight comment

* add weight to technical collective

* another DB whitelist optimization

Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Guillaume Thiolliere <[email protected]>

* Implement request-responses protocols

* Add tests

* Fix sc-cli

* Apply suggestions from code review

Co-authored-by: Max Inden <[email protected]>

* Fix naming

* Fix other issues

* Other naming fix

* Fix error logging

* Max sizes to u64

* Don't kill connections on refusal to process

* Adjust comment

Co-authored-by: Max Inden <[email protected]>

* babe: fix report_equivocation weight

* node: bump spec_version

* babe: fix floor in report_equivocation weight calculation

Co-authored-by: Gavin Wood <[email protected]>

* grandpa: fix floor in report_equivocation weight calculation

* babe, grandpa: add test for weight_for::report_equivocation

Co-authored-by: Gavin Wood <[email protected]>

* Better prime election.

* improve docs

* more sensible variable names

* link to Borda count wiki

Co-authored-by: Shawn Tabrizi <[email protected]>

* Support staking payout to any account

* fix offences benchmarks

* Enforce that ProtocolId is a string

* Fix test

* Fix unwraps and other issues with benchmarks

* undo changes to contracts pallet

* client/authority-discovery: Test addresses per authority limit

* client/authority-discovery: Limit number of addresses per authority

* WIP: read child trie and write child trie

* add test

* refactor a bit + improve log

* better naming

* trigger CI

* Revert "trigger CI"

This reverts commit d0aadaeb.

Alert on high file descriptor allocation.