Add `gates.CNOT` as a native gate in gate decomposition

[csookim]

This covers issue #1421.

Checklist:

• [x] Reviewers confirm new code works as expected.
• [x] Tests are passing.
• [x] Coverage does not decrease.
• [x] Documentation is updated.

[csookim]

Example

circ = Circuit(2)
circ.add(gates.H(0))
circ.add(gates.CNOT(0, 1))
circ.add(gates.SWAP(0, 1))
circ.add(gates.CZ(0, 1))
circ.add(gates.M(0, 1))

gate_list = [gates.GPI2, gates.RZ, gates.Z, gates.M, gates.CNOT]
native_gates = NativeGates(0).from_gatelist(gate_list)

custom_pipeline = Passes([Unroller(native_gates=native_gates)])
unrolled_circuit, _ = custom_pipeline(circ)

print(unrolled_circuit.draw(line_wrap=100))

Output

q0: ─Z─GPI2─o─o─X─o────────o────────M─
q1: ────────X─X─o─X─Z─GPI2─X─Z─GPI2─M─

[alecandido]

Btw, why are you deleting Codecov comments? Just out of curiosity (the checks in the workflows are still there; so it's just a different in appearance, but no substantial change, so it's even fine)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.94%. Comparing base (8fb9af9) to head (3281871). Report is 24 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1422 +/- ## ======================================= Coverage 99.94% 99.94% ======================================= Files 78 78 Lines 11297 11304 +7 ======================================= + Hits 11291 11298 +7 Misses 6 6 ``` | [Flag](https://app.codecov.io/gh/qiboteam/qibo/pull/1422/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/qiboteam/qibo/pull/1422/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | `99.94% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#carryforward-flags-in-the-pull-request-comment) to find out more.

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[csookim]

Btw, why are you deleting Codecov comments? Just out of curiosity (the checks in the workflows are still there; so it's just a different in appearance, but no substantial change, so it's even fine)

I deleted it to avoid confusion, as the removed one was the coverage of the previous code. Will it be updated automatically?

[alecandido]

I deleted it to avoid confusion, as the removed one was the coverage of the previous code. Will it be updated automatically?

Indeed, if you leave it there it will edit the same comment, instead of adding a new one :)