fix: FunctionsClient constructor default options

[egor-romanov]

What kind of change does this PR introduce?

fix FunctionsClient constructor

What is the current behavior?

FunctionsClient constructor requires to pass {} as options if you don't want to pass headers or fetch

What is the new behavior?

Add options default value {} in FunctionsClient constructor

[soedirgo]

👍 headers = {} should work too, e.g. https://github.com/supabase/postgrest-js/blob/e612a5d2790a66d04a829c12cf6ceed1b5c293c6/src/PostgrestClient.ts#L21-L33

[thorwebdev]

I'd leave the headers default initialisation to empty object in the constructor. Wdyt?

I like the addition of making full constructor options default to empty object and therefore optional 👍

[github-actions]

🎉 This PR is included in version 1.3.3 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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