refactor(glue): add MobulaTensor

[coveralls]

Pull Request Test Coverage Report for Build 896

• 85 of 94 (90.43%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 85.11%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mobula/glue/torch_glue.py	21	22	95.45%
mobula/glue/common.py	12	16	75.0%
mobula/glue/mxnet_glue.py	14	18	77.78%
<!--	Total:	85	94	90.43%	-->

Totals
Change from base Build 894:	0.06%
Covered Lines:	2012
Relevant Lines:	2364

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💛 - Coveralls