[ENH] Add support for handling file extensions in load_from_tsfile

[Sharathchenna]

What does this implement/fix? Explain your changes.
I made changes in the data_loaders.py to check the extension of the file. If an extension is already like .txt, it will not append .ts. If there is no extension, it will append .ts extension

resolves #1922

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[Sharathchenna]

@MatthewMiddlehurst Hey! Hello can you please check into this code because i ran pre-commit command and made some changes but the test is still failing . Thanks!

[baraline]

Looks like it solve the issue, thanks for contributing !
I'll leave the merging to @TonyBagnall so he can confirm that's what he wanted.

[TonyBagnall]

great, thanks for that

[TonyBagnall]

@all-contributors add @Sharathchenna for code

[allcontributors]

@TonyBagnall

I've put up a pull request to add @Sharathchenna! 🎉