[WIP] Yet Another Parachain

[s0me0ne-unkn0wn]

This PR adds yet another testing parachain (YAP) with the following features:

• It parses its own chainspec name to learn to which relay chain it belongs and what parachain ID it should use (examples being yap-rococo-local-100 or yap-kusama-live-2089);
• Its genesis state contains 16000 pre-funded account pairs derived from seeds //Sender/<n> and //Receiver/<n> where n ∈ [0, 15999]. Regular well-known testing accounts are also available;
• It contains balances and sudo pallets (the latter is bound to the Alice account) and is missing the XCM functionality;
• It has CheckNonce and CheckGenesis signed extensions disabled.

[eskimor]

Would 12k suffice? (Given our current PoV size limitations, might be beneficial for the community spamming chains.)

[github-actions]

This pull request is amending an existing release. Please proceed with extreme caution,
as to not impact downstream teams that rely on the stability of it. Some things to consider:

• Backports are only for 'patch' or 'minor' changes. No 'major' or other breaking change.
• Should be a legit fix for some bug, not adding tons of new features.
• Must either be already audited or not need an audit.

Emergency Bypass

If you really need to bypass this check: add validate: false to each crate
in the Prdoc where a breaking change is introduced. This will release a new major
version of that crate and all its reverse dependencies and basically break the release.