Implement `cmd/debug_tools`

[varex83]

Scope

Port charon/cmd/debug_tools.go (~13 LOC) — the pluto debug command group containing debug subcommands.

References

• Go: https://github.com/ObolNetwork/charon/blob/main/cmd/debug_tools.go
• Tests: cmd/debug_tools_internal_test.go (~111 LOC)

Acceptance

• Flag/help parity with charon
• Tests ported and green
• cargo clippy --workspace --all-targets --all-features -- -D warnings clean