Refactor SignerSource to expose DerivationPath to other kinds of signers (backport #16933)

[mergify]

This is an automatic backport of pull request #16933 done by Mergify.
Cherry-pick of d6f30b7 has failed:

On branch mergify/bp/v1.6/pr-16933
Your branch is up to date with 'origin/v1.6'.

You are currently cherry-picking commit d6f30b753.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   Cargo.lock
	modified:   clap-utils/Cargo.toml
	modified:   clap-utils/src/fee_payer.rs
	modified:   clap-utils/src/input_parsers.rs
	modified:   clap-utils/src/input_validators.rs
	modified:   clap-utils/src/keypair.rs
	modified:   clap-utils/src/memo.rs
	modified:   clap-utils/src/nonce.rs
	modified:   clap-utils/src/offline.rs
	modified:   programs/bpf/Cargo.lock
	modified:   remote-wallet/src/locator.rs
	modified:   remote-wallet/src/remote_keypair.rs
	modified:   remote-wallet/src/remote_wallet.rs
	modified:   sdk/src/derivation_path.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   sdk/Cargo.toml

To fix up this pull request, you can check it out locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.io/