Integrate Xanadu Cloud Client

[thisac]

Context: The Xanadu Cloud Client (XCC) has replaced the internal Strawberry Fields API client. Due to this, quite a few (breaking) changes are introduced. Part of this is due to the job format change from npy to npz (which is handled by the XCC), as well as the switch to using the XCC Job and Connection classes instead of their Strawberry Fields counterparts.

Description of the Change:

• The sf CLI has been removed in favour of the Xanadu Cloud Client. (#642)

• The sf.api.Connection class has been replaced with the xcc.Connection class. (#645)

• The sf.configuration module has been replaced with the xcc.Settings class. (#649)

  This means that Xanadu Cloud credentials are now stored in exactly one location, the path to which depends on your operating system:

  1. Windows: C:\Users\%USERNAME%\AppData\Local\Xanadu\xanadu-cloud\.env

  2. MacOS: /home/$USER/Library/Application\ Support/xanadu-cloud/.env

  3. Linux: /home/$USER/.config/xanadu-cloud/.env

  The format of the configuration file has also changed to .env and the names of some fields have been updated. For example,

• The sf.api.Job class has been replaced with the xcc.Job class. (#650)

• The sf.api.Result class has been updated to support the Xanadu Cloud Client integration. (#651)

  While Result.samples should return the same type and shape as before, the Result.all_samples property has been renamed to Result.samples_dict and returns the samples as a dictionary with corresponding measured modes as keys.

• The sf.api.DeviceSpec class has been updated to support the Xanadu Cloud Client integration. (#644)

  It now works as a container for a device specification dictionary. There are no more API connection usages, and DeviceSpec.target is retrieved from the device specification rather than passed at initialization.

• The api subpackage has been removed and the contained DeviceSpec and Result classes have been moved to the root strawberryfields folder.

Benefits: The API is contained in a separate package and is no longer part of Strawberry Fields, making it easier to maintain.

Possible Drawbacks: A lot of breaking changes are introduced (see changelog), which will necessitate that users upgrade to v0.20.0 to be able to continue to submit jobs to the Xanadu Cloud.

Related GitHub Issues: None

[codecov[bot]]

Codecov Report

Merging #656 (7267f6e) into master (d7a4ec4) will increase coverage by 0.00%. The diff coverage is 91.22%.

@@           Coverage Diff            @@
##           master     #656    +/-   ##
========================================
  Coverage   98.27%   98.28%            
========================================
  Files          77       72     -5     
  Lines        9178     8810   -368     
========================================
- Hits         9020     8659   -361     
+ Misses        158      151     -7     

Impacted Files	Coverage Δ
strawberryfields/engine.py	95.93% <88.05%> (-0.56%)	:arrow_down:
strawberryfields/result.py	92.85% <88.88%> (ø)
strawberryfields/__init__.py	95.83% <100.00%> (+0.18%)	:arrow_up:
...trawberryfields/backends/bosonicbackend/backend.py	100.00% <100.00%> (ø)
strawberryfields/devicespec.py	96.15% <100.00%> (ø)
strawberryfields/program.py	100.00% <100.00%> (ø)
strawberryfields/tdm/tdmprogram.py	98.26% <100.00%> (ø)

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