Add QIR compilation support

[thisac]

Add support for QIR compilation to dwave-gate. This includes support for:

• Compiling arbitrary circuits into QIR following the QIR Base Profile.
• Parsing QIR strings and bitcode and returning a dwave-gate Circuit object.
• Loading QIR strings and bitcode into existing circuits.

circuit = Circuit(3, 3)

with circuit.context as reg:
    ops.X(reg.q[0])
    ops.CX(reg.q[1], reg.q[2])
    ops.Measurement(reg.q) | reg.c

qir_string = circuit.to_qir()

circuit = Circuit.from_qir(qir_string)

[codecov[bot]]

Codecov Report

Merging #32 (861915e) into master (ecb8b06) will decrease coverage by 0.14%. The diff coverage is 99.40%.

@@             Coverage Diff             @@
##            master      #32      +/-   ##
===========================================
- Coverage   100.00%   99.86%   -0.14%     
===========================================
  Files           15       19       +4     
  Lines         1191     1523     +332     
  Branches       184      250      +66     
===========================================
+ Hits          1191     1521     +330     
- Misses           0        1       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
dwave/gate/operations/operations.py	100.00% <ø> (ø)
dwave/gate/tools/unitary.py	100.00% <ø> (ø)
dwave/gate/utils.py	100.00% <ø> (ø)
dwave/gate/qir/loader.py	97.29% <97.29%> (ø)
dwave/gate/circuit.py	100.00% <100.00%> (ø)
dwave/gate/operations/base.py	100.00% <100.00%> (ø)
dwave/gate/qir/__init__.py	100.00% <100.00%> (ø)
dwave/gate/qir/compiler.py	100.00% <100.00%> (ø)
dwave/gate/qir/instructions.py	100.00% <100.00%> (ø)

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