[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.