Added The BInary Expected_Calibration_Error (ECE) Metric

[Zekrom-7780]

Fixes #1009

Description:

Added the binary ECE(Expected_Calibration_Error) metric.

Reviewers

cc. @vfdev-5

P.S.

• Do I have to add new tests, and documentation for the new metric? I don't know whether I had to add them or not.
• Will be doing the MultiClassECE in a new pull request, since it feels that it is the better thing to do.

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• [ ] Apply: All new business logic should have corresponding unit tests.
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[Zekrom-7780]

@vfdev-5 made the changes,

Ready for comments

Won't be possible to have a single class for binary and multi-class ECE ?

Will do it in the next commits if you want, actually I just wanted to understand how does the binaryclassECE work, and by completing that, the other one would be a piece of cake to do, hence just focusing on this one rn

[vfdev-5]

@Zekrom-7780 any updates on this PR ?

[Zekrom-7780]

@vfdev-5 I'll create the Multi-Class-ECE in the next 3-4 hours, and push the changes

Then i'll move to writing the unit-tests, where I'll need your help, since I haven't written any as such

[Zekrom-7780]

@vfdev-5 , made the changes