feat: add HostedButtons component

[jshawl]

This PR adds types for a new HostedButtons component. Also see paypal/react-paypal-js#402

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a5e9424) 100.00% compared to head (d3e5e52) 100.00%.
Report is 2 commits behind head on main.

❗ Current head d3e5e52 differs from pull request most recent head 52b25b6. Consider uploading reports for the commit 52b25b6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #440   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          261       261           
  Branches        47        47           
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  Hits           261       261           

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