refactor: Add params to node context #18322

EnsureParams(node) and Params() are completely identical, but slowly removing the global Params() makes the code easier to reason about and easier to test. Some places do not rely on the global, but pass around the params through deep call stacks. If the params are passed along with a node context, those could be removed, as just passing a node context should be sufficient.

I suggest that existing code stays as is, but whenever code is touched for other reasons, it could be updated to use EnsureParams().

Concept ACK: less is more when it comes to globals

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #18267 (BIP-325: Signet [consensus] by kallewoof)
• #17997 (refactor: Remove mempool global from net by MarcoFalke)
• #17786 (refactor: Nuke policy/fees->mempool circular dependencies by hebasto)
• #17434 (Move parsing from init.cpp to where values are needed by Xekyo)
• #17037 (Testschains: Many regtests with different genesis and default datadir by jtimon)
• #10443 (Add fee_est tool for debugging fee estimation code by ryanofsky)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

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