feature: context manager for reservation arns

[mbeach-aws]

feature: context manager for reservation arns

Issue #, if available:

Description of changes: Adds a context manager that temporarily modifies the run method of a device object to include a specified reservation_arn in all calls within the context. This is useful for ensuring that all quantum task run within the context are associated with a given reservation ARN (Amazon Resource Name).

Example usage

with reservation(device, reservation_arn="<my_reservation_arn>"):
    task1 = device.run(circuit, shots)
    task2 = device.run(circuit, shots)

Testing done:

Merge Checklist

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General

• [x] I have read the CONTRIBUTING doc
• [x] I used the commit message format described in CONTRIBUTING
• [x] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• [x] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [x] I have checked that my tests are not configured for a specific region or account (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (53aba5e) to head (d3bf64e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #949 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 134 136 +2 Lines 8911 8932 +21 Branches 2007 2010 +3 ========================================= + Hits 8911 8932 +21 ```

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[mbeach-aws]

closing to make sure qiskit/PL is supported