Inconsistent naming of baccoemu baryons object

[zdu863]

1. Renamed BaccoemuBaryons class to BaryonsBaccoemu.
2. Created a deprecated class BaccoemuBaryons that will generate a deprecation warning when called.

[coveralls]

Pull Request Test Coverage Report for Build 8459738288

Details

• 8 of 10 (80.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 97.456%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyccl/baryons/baccoemu_baryons.py	8	10	80.0%
<!--	Total:	8	10	80.0%	-->

Totals
Change from base Build 8354757719:	-0.03%
Covered Lines:	6552
Relevant Lines:	6723

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💛 - Coveralls