feat: add ml/base/loss/float64/hinge

[nakul-krishnakumar]

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Resolves None.

Description

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This pull request:

• Adds ml/base/loss/float64/hinge.

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Coverage Report

Package	Statements	Branches	Functions	Lines
ml/base/loss/float64/hinge	$\color{green}196/196$ $\color{green}+0.00%$	$\color{green}11/11$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}196/196$ $\color{green}+0.00%$

The above coverage report was generated for the changes in this PR.

[nakul-krishnakumar]

Clarifications required:

1. hinge( y, p ) loss function expect y to be either +1 or -1. Should I mention this in the README.md and repl.txt?
2. Please have a look at the fixture generation and lmk if the approach is apt.
3. Should I keep y as integer or double? y is the target class label, so it would be an integer, but keeping it as double seems more appropriate.

[nakul-krishnakumar]

/stdlib update-copyright-years