feat: add configuration to run specific scripts on main thread

[DanBeckDev]

Feature as requested by: #161

It was originally suggested that the configuration should look like this:

<script>
partytown = {
  loadWithPartytown: (url) => {
     if (/* your own logic for what to load in partytown vs not */) return true;
     return false;
  }
}
</script>

I have created it as an array:

/**
   * This array can be used to filter which script are executed via
   * Partytown and which you would like to execute on the main thread.
   * 
   * @example loadScriptsOnMainThread:['https://test.com/analytics.js']
   * // Loads the `https://test.com/analytics.js` script on the main thread 
*/
<script>
partytown = {
  loadScriptsOnMainThread: ['https://test.com/analytics.js']
}
</script>

This is because when the function gets serialized the function is a string and cannot execute.
If we wish to proceed with the idea above I am happy to extend the serialisation functionality but I deem it overkill myself.

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Name	Status	Preview	Updated
partytown	✅ Ready (Inspect)	Visit Preview	Jun 24, 2022 at 3:19PM (UTC)

[DanBeckDev]

Thank you for the review @khuezy.
Please see my latest commit resolving the issues found above.

[khuezy]

Thanks for the PR! I'm not a code owner so I don't think my approval would be sufficient.

[DanBeckDev]

@steve8708 Any chance I could get a review, please?

[steve8708]

Absolutely, @adamdbradley is crunching on a major release for Qwik City and then can hop in here for a review

[robertwatts]

Hello, thank you so much for taking this on @DanBeckDev. We want to use PartyTown on wonderbly.com but are blocked by this issue. If @steve8708 or @adamdbradley is able to take a look at this feature so it can be released we would be very grateful - I'm sure this would be useful for many others as well.

[garethweaver]

This is great, thanks!