fix: fix request body type when optional

[nickcaballero]

Changes

• Fix Unable to use body in POST/PATCH requests when another method doesn't have body defined #34 by matching the optional requestBody
• Split typed options from fetch() options to make it reusable for other HTTP clients

Checklist

• Tests updated
• README updated

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[drwpow]

Great tests, thank you! Left a minor comment on making the written tests a bit more clear in purpose and reducing boilerplate (at first glance it’s not clear what these tests are testing because they copy code from other tests). But not blocking. Will merge either way eventually.

[KriszKecskes]

Hi,
Is there any news about this? I faced the body type issue today. :-(

[drwpow]

🎉 Awesome! These types of inverse tests are very helpful (sometimes even more helpful than the “assert no error” tests.

[drwpow]

Thanks again! Happy to merge as-is; the lint issue is minor and I can fix after merge.