Add axis labels for 1d plotting in Plotterly, add option to pass color to legend in Plotter.plot_ground_truths

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 93.59%. Comparing base (072fb92) to head (38fd827).

Files	Patch %	Lines
stonesoup/plotter.py	72.72%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1019 +/- ## ========================================== - Coverage 93.61% 93.59% -0.02% ========================================== Files 203 203 Lines 13103 13111 +8 Branches 2673 2677 +4 ========================================== + Hits 12266 12271 +5 - Misses 590 592 +2 - Partials 247 248 +1 ``` | [Flag](https://app.codecov.io/gh/dstl/Stone-Soup/pull/1019/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dstl) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/dstl/Stone-Soup/pull/1019/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dstl) | `65.92% <72.72%> (-0.01%)` | :arrow_down: | | [unittests](https://app.codecov.io/gh/dstl/Stone-Soup/pull/1019/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dstl) | `89.23% <45.45%> (-0.04%)` | :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=dstl#carryforward-flags-in-the-pull-request-comment) to find out more.

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