Feat: add stellar ledger as signer #6894

Job	Run time
fmt	5s
cargo-deny (advisories)	34s
build-and-test (msrv, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	48s
check-generated-full-help-docs	20s
cargo-deny (bans)	34s
build-and-test (msrv, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	1m 27s
cargo-deny (licenses)	33s
build-and-test (msrv, macos-latest, x86_64-apple-darwin)	45s
cargo-deny (sources)	33s
publish-dry-run	0s
build-and-test (msrv, macos-latest, aarch64-apple-darwin)	40s
build-and-test (msrv, windows-latest-8-cores, x86_64-pc-windows-msvc)	39s
build-and-test (latest, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	40s
build-and-test (latest, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	1m 12s
build-and-test (latest, macos-latest, x86_64-apple-darwin)	33s
build-and-test (latest, macos-latest, aarch64-apple-darwin)	33s
build-and-test (latest, windows-latest-8-cores, x86_64-pc-windows-msvc)	23s
complete	1s
	10m 20s

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