`tket2::serialize::pytket` should support hseries operations

[aborgna-q]

Hugrs can encode native hseries-specific operations for some expressions (e.g. ZZMax gates).

When trying to encode the hugr as a pytket circuit, we need to define operation equivalences between hugr extension ops and tket-json-rs ops.
This is done here for Tk2Ops:

tket2/tket2/src/serialize/pytket/op/native.rs

Lines 52 to 55 in 86972f8

	pub fn try_from_tk2op(tk2op: Tk2Op) -> Option<Self> {
	let serial_op = match tk2op {
	Tk2Op::H => Tk1OpType::H,
	Tk2Op::CX => Tk1OpType::CX,

However, we now also need to define the same equivalences for the operations in HSeriesOp but those are defined in a dependent crate.

It might be possible to do some dynamic dispatch magic here, or we may end up having to split the tket2 package so that the pytket converter can depend on hseries too...

[aborgna-q]

#1039