Add pading between rdt_TableBody and rdt_TableHeadROW using customStyle

[Poojatilekar]

Issue Check list

• [ ] Agree to the Code of Conduct
• [ ] Read the README
• [ ] You are using React 16.8.0+
• [ ] You installed styled-components
• [ ] Include relevant code or preferably a code sandbox

Describe the bug

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To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

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Code Sandbox, Screenshots, or Relevant Code

Please include a codesandbox to help expedite troublshooting.

https://codesandbox.io/embed/react-data-table-sandbox-ccyuu

Otherwise, add screenshots and/or complete sample code to help explain your problem.

Versions (please complete the following information)

• React (RDT requires 16.8.0+)
• Styled Components
• OS: [e.g. iOS]
• Browser [e.g. chrome, safari, firefox]

Additional context

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[Poojatilekar]

how to access body parameter in customstyle.