fix: TableBodyRow color and border

[RyanZhiNie]

📑 Description

The current processing of <TableBodyRow>'s border stye is really weird. It changes the style of background color rather than border. And in fact, the prop trClass is presently used to set the styles when there are borders, and the value of this prop is also a background color style, which is also very weird. What's more, these problems cause the appearance of examples different from those displayed in Flowbite.

E.g., Flowbite (there are borders between every two <tr>s):

Flowbite-Svelte (the borders are missing):

BTW, I export color in my PR because I think there may be a situation when users want to set colors for different <tr> in a table.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• I have checked the page with https://validator.unl.edu/
• All the tests have passed
• My pull request is based on the latest commit (not the npm version).

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Name	Status	Preview	Comments	Updated
flowbite-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 17, 2023 at 3:32PM (UTC)
flowbite-svelte-update	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 17, 2023 at 3:32PM (UTC)

[shinokada]

Thank you for your PR.