Introduce new Proxy for Parachain Registration

[SBalaguer]

With the development of interfaces to aid the deployment of parachain projects, it would be beneficial to have a new proxy type that allows only restricted actions that pertain to deploying a parachain. Currently the only option other than "Any" is a proxy of type "NonTransfer" which is very permissive.

Suggested Solution

impl InstanceFilter<RuntimeCall> for ProxyType {
	fn filter(&self, c: &RuntimeCall) -> bool {
		match self {
                        [...], // --> other proxy types
                	ProxyType::ParaRegistration => matches!(
					c,
					RuntimeCall::Registrar(paras_registrar::Call::reserve { .. }) | // --> gets the paraID
			        	RuntimeCall::Registrar(paras_registrar::Call::register { .. }) | // --> registers wasm/head
					RuntimeCall::Proxy(pallet_proxy::Call::remove_proxy { .. }) | // --> removes proxy
				),
                        [...] // --> other proxy types
			}

[bkchr]

@SBalaguer feel free to open a pr.