Feat: add stellar ledger as signer #7228

Job	Run time
cargo-deny (advisories)	50s
check-generated-full-help-docs	4m 36s
cargo-deny (bans)	42s
fmt	29s
cargo-deny (licenses)	42s
build-and-test (msrv, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	6m 52s
publish-dry-run	0s
cargo-deny (sources)	44s
build-and-test (msrv, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	8m 12s
build-and-test (msrv, macos-latest, x86_64-apple-darwin)	14m 15s
build-and-test (msrv, macos-latest, aarch64-apple-darwin)	17m 18s
build-and-test (msrv, windows-latest-8-cores, x86_64-pc-windows-msvc)	12m 59s
build-and-test (latest, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu)	6m 24s
build-and-test (latest, ubuntu-jammy-16-cores-arm64, aarch64-unknown-linux-gnu)	8m 2s
build-and-test (latest, macos-latest, x86_64-apple-darwin)	15m 37s
build-and-test (latest, macos-latest, aarch64-apple-darwin)	13m 38s
build-and-test (latest, windows-latest-8-cores, x86_64-pc-windows-msvc)	11m 27s
complete	1s
	2h 2m 48s

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