Split up `KeysInterface` parameters into its comprising traits.#1952

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arik-so wants to merge 6 commits intolightningdevkit:mainfrom

arik-so:2023-01-keys-interface-removal-chunked

Commits on Jan 14, 2023

Split up generic parameters that used to comprise `KeysInterface` for `ChannelMonitor` and `OnchainTxHandler` types.
arik-so
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Split up generic parameters that used to comprise `KeysInterface` in `blinded_path.rs` and `inbound_payment.rs`.
arik-so
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Substitute 'KeysInterface' generic parameter with one of its comprising traits where a singular substitution is possible.
arik-so
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Split up generic parameters that used to comprise `KeysInterface` for `Channel` and `ChannelManager` types.
arik-so
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Remove `KeysInterface` trait.
arik-so
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Decouple lifetimes for trait implementations that used to comprise `KeysInterface`.
arik-so
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