Update/embed bqm

[thisac]

• Updates embedding.transforms.embed_bqm() for improved performance and cleaner code
• Updates the uniform_torque_compensation() and scaled() functions in embedding.chain_strength for improved performance and cleaner code

Requires dwave-cloud-client#556 fixed for doctest to pass

[codecov[bot]]

Codecov Report

Merging #498 (b3b0c1d) into master (7d9cc7f) will decrease coverage by 3.17%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #498      +/-   ##
==========================================
- Coverage   90.87%   87.70%   -3.17%     
==========================================
  Files          24       24              
  Lines        1676     1676              
==========================================
- Hits         1523     1470      -53     
- Misses        153      206      +53     

see 6 files with indirect coverage changes

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