add plot Y axis label type (float, integer)

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Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 58.75%. Comparing base (ef7a091) to head (1dfc3fe).

Files with missing lines	Patch %	Lines
plot.go	78.26%	4 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #66 +/- ## ========================================== - Coverage 58.75% 58.75% -0.01% ========================================== Files 9 9 Lines 868 880 +12 ========================================== + Hits 510 517 +7 - Misses 347 351 +4 - Partials 11 12 +1 ``` | [Flag](https://app.codecov.io/gh/navidys/tvxwidgets/pull/66/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Navid+Yaghoobi) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/navidys/tvxwidgets/pull/66/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Navid+Yaghoobi) | `58.75% <78.26%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Navid+Yaghoobi#carryforward-flags-in-the-pull-request-comment) to find out more.

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