Add support of BitVec type from bitvec

[gshep]

Problem to Solve

sails-idl-gen fails if BitVec is used by any program constructors or service methods:

thread 'main' panicked at gear-programs/checkpoint-light-client/build.rs:22:112:
  called `Result::unwrap()` on an `Err` value: TypeIsUnsupported("Type { path: Path { segments: [] }, type_params: [], type_def: BitSequence(TypeDefBitSequence { bit_store_type: UntrackedSymbol { id: 2, marker: PhantomData<fn() -> core::any::TypeId> }, bit_order_type: UntrackedSymbol { id: 28, marker: PhantomData<fn() -> core::any::TypeId> } }), docs: [] }")
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Possible Solution

Implement support of bitvec crate.

Notes

No response