handle useLoadData synchronous exception edge case

[nthurow]

Proposed changes

If the fetchData function passed to useLoadData throws a synchronous exception, then useLoadData should handle that and should return an initial state of "error". Previously, useLoadData was not handling this scenario and a fetchData function that threw a synchronous exception would result in an unhandled exception.

For example, the following scenario currently throws an unhandled exception:

useLoadData(() => {
  throw 'an error';
});

This PR allows the above scenario to be correctly handled such that useLoadData would simply return:

{
  inProgress: false,
  result: undefined,
  isError: true,
  error: 'an error'
}

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

[NielsJPeschel]

I will definitely look into adding more comments throughout this code like this

[NielsJPeschel]

Awesome PR!