[chore] move helper binaries to contrib folder

[wileyj]

stacks-core/stackslib/Cargo.toml

Lines 21 to 31 in fe868ea

	[[bin]]
	name = "stacks-inspect"
	path = "src/main.rs"
	[[bin]]
	name = "clarity-cli"
	path = "src/clarity_cli_main.rs"
	[[bin]]
	name = "blockstack-cli"
	path = "src/blockstack_cli.rs"

https://github.com/stacks-network/stacks-core/blob/master/stacks-node/src/stacks_events.rs

are not required for stacks-node/stacks-signer and could probably be moved out of the main workspace or into ./contrib

cc @Jiloc