[TMath] Add moving mean, moving median and mode

[pitkajuh]

This Pull request:

Changes or fixes:

Dear all. This pull request adds moving mean, moving median and mode to Root's TMath. I tried to update the documentation (https://root.cern/doc/v630/namespaceTMath.html) but I could not figure out where to find the files on Github. Please can someone guide me?

I will leave the PR in draft state. I will appreciate any feedback you can give me.

Checklist:

• tested changes locally
• updated the docs (if necessary)

This PR fixes #14258
LastTest.log.tar.gz

[phsft-bot]

Can one of the admins verify this patch?

[github-actions]

Test Results

     8 files       8 suites   1d 16h 13m 42s ⏱️
 2 573 tests  2 573 ✅ 0 💤 0 ❌
19 933 runs  19 933 ✅ 0 💤 0 ❌

Results for commit 2c241ef.

♻️ This comment has been updated with latest results.

[ferdymercury]

Thanks for your PR !
The documentation is automatically generated based on the comments on top of the function implementation. No need to modify anything extra.
You have to follow the Doxygen format.
So please use things like the \param \return keywords.

      /**
       * a normal member taking two arguments and returning an integer value.
       * \param a an integer argument.
       * \param s a constant character pointer.
       * \see Javadoc_Test()
       * \return The test results
       */

[pitkajuh]

Dear All. I edited the according to suggestions and added descriptions for the functions. If there is anything you want me to change, please let me know.

[pitkajuh]

FYI, some of the suggestions given for #15100 are also applicable in this PR. I will make changes accordingly.