Adjoint support in Braket.jl

[kshyatt-aws]

Issue #, if available:

Description of changes:

Add Julia support for adjoint gradient computation on Amazon Braket.

Switches default IR format to OpenQASM.

Testing done:

Unit and integ tests passed locally.

Merge Checklist

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[codecov-commenter]

Codecov Report

Base: 94.43% // Head: 93.02% // Decreases project coverage by -1.40% ⚠️

Coverage data is based on head (e69037c) compared to base (3d68d4f).
Patch coverage: 76.09% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   94.43%   93.02%   -1.41%     
==========================================
  Files          33       33              
  Lines        3504     3671     +167     
==========================================
+ Hits         3309     3415     +106     
- Misses        195      256      +61     

Impacted Files	Coverage Δ
src/schemas.jl	100.00% <ø> (ø)
src/task_batch.jl	84.28% <50.00%> (-7.65%)	⬇️
src/raw_schema.jl	95.76% <58.33%> (-0.94%)	⬇️
src/task.jl	91.31% <65.30%> (-6.96%)	⬇️
src/circuit.jl	95.71% <70.58%> (-1.26%)	⬇️
src/results.jl	92.15% <77.77%> (-1.88%)	⬇️
src/observables.jl	86.30% <80.64%> (-11.48%)	⬇️
PyBraket/src/pycircuit.jl	76.47% <90.90%> (-1.66%)	⬇️
PyBraket/src/pyschema.jl	98.38% <100.00%> (+0.69%)	⬆️
src/Braket.jl	100.00% <100.00%> (ø)
... and 6 more

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