Add generic Params type parameter to persistence traits

[evanlinjin]

Description

This is a potential solution for the problem @matthiasdebernardini mentioned in #1562 (comment).

However, I'm wondering if it would be better for persistence implementations to internally provide custom configuration. I.e.

type NamedWalletConnection<'c> {
    wallet_name: String,
    conn: sqlx::Connection<'c>,
}

impl<'c> AsyncWalletPersister for NamedWalletConnection<'c> {
    // ... stuff ...
}

I'm worried that this PR will introduce unnecessary complexity.

Notes to the reviewers

Refer to the conversation in #1562 (which this PR is based on).

Changelog notice

• Changed bdk_wallet persistence traits to have a generic Params type parameter to allow persister implementations to include custom configurations. This is introduced via a common trait WalletPersisterCommon.

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

New Features:

• I've added tests for the new feature
• I've added docs for the new feature

[matthiasdebernardini]

I can work with this, thanks!

[notmandatory]

@matthiasdebernardini did you get a chance to try just setting wallet name when you create your postgres store struct? I still think that would be simpler and then this PR wouldn't be needed.

EDIT: It looks like you did get this working another way: #1562 (comment)

[matthiasdebernardini]

yup, I don't need it, can use Store anyways

[evanlinjin]

Closing for now since the solution in the PR description is sufficient.