Refactor SignerSource to expose DerivationPath to other kinds of signers (backport #16933) (#16940)

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

* One use statement

* Add stdin uri scheme

* Convert parse_signer_source to return Result

* A-Z deps

* Convert Usb data to Locator

* Pull DerivationPath out of Locator

* Wrap SignerSource to share derivation_path

* Review comments

* Check Filepath existence, readability in parse_signer_source

(cherry picked from commit d6f30b7537)

# Conflicts:
#	Cargo.lock
#	clap-utils/src/memo.rs
#	remote-wallet/src/locator.rs
#	sdk/Cargo.toml

* Fix conflicts

* Fix legacy compile test

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

programs/bpf/Cargo.lock

@@ -3328,6 +3328,7 @@ dependencies = [
  "num-derive 0.3.0",
  "num-traits",
  "pbkdf2 0.6.0",
+ "qstring",
  "rand 0.7.3",
  "rand_chacha 0.2.2",
  "rustc_version",
@@ -3345,6 +3346,7 @@ dependencies = [
  "solana-program 1.5.20",
  "solana-sdk-macro 1.5.20",
  "thiserror",
+ "uriparse",
 ]
 
 [[package]]