PurifierProt - Entanglement Purification protocol

[sagnikpal2004]

• The code is properly formatted and commented.
• Substantial new functionality is documented within the docs.
• All new functionality is tested.
• All of the automated tests on github pass.

Changelog:

• Add PurifierProt, a protocol that searches for entangled pairs between two nodes and purifies them.

Todo:

• Make it compatible with other purification circuits

Closes #246
Resolves #137

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.

Project coverage is 61.68%. Comparing base (612cb85) to head (0844f45).

Files with missing lines	Patch %	Lines
src/ProtocolZoo/purifier.jl	0.00%	34 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (612cb85) and HEAD (0844f45). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (612cb85)	HEAD (0844f45)
	15	5

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #247      +/-   ##
==========================================
- Coverage   69.72%   61.68%   -8.05%     
==========================================
  Files          52       53       +1     
  Lines        2144     2059      -85     
==========================================
- Hits         1495     1270     -225     
- Misses        649      789     +140     

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