Ledger hardware wallet integration (bp #8068)

[mergify]

This is an automated backport of pull request #8068 done by Mergify.io

Cherry-pick of ed0c1d3 has failed:

On branch mergify/bp/v0.23/pr-8068
Your branch is up to date with 'origin/v0.23'.

You are currently cherry-picking commit ed0c1d3b5.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   Cargo.toml
	modified:   clap-utils/src/input_parsers.rs
	modified:   clap-utils/src/input_validators.rs
	modified:   clap-utils/src/keypair.rs
	modified:   cli/src/cli.rs
	modified:   cli/src/main.rs
	modified:   keygen/src/keygen.rs
	new file:   remote-wallet/Cargo.toml
	new file:   remote-wallet/src/bin/ledger-udev.rs
	new file:   remote-wallet/src/ledger.rs
	new file:   remote-wallet/src/lib.rs
	new file:   remote-wallet/src/remote_wallet.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   Cargo.lock
	both modified:   clap-utils/Cargo.toml
	both modified:   cli/Cargo.toml
	both modified:   keygen/Cargo.toml

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[solana-grimes]

😱 New commits were pushed while the automerge label was present.

[codecov]

Codecov Report

Merging #8169 into v0.23 will decrease coverage by 0.6%.
The diff coverage is 66.6%.

@@           Coverage Diff           @@
##           v0.23   #8169     +/-   ##
=======================================
- Coverage   82.1%   81.4%   -0.7%     
=======================================
  Files        246     251      +5     
  Lines      53197   54178    +981     
=======================================
+ Hits       43702   44136    +434     
- Misses      9495   10042    +547