Implement FormData.set method and handle Blob instances

[acostalima]

Summary

The proposed changes brings FormData's implementation one step closer to spec compliance by:

• Implementing .set method.
• Adding support to filename argument on both .set and .append for Blob and File values.
• Handling Blob instances in .getParts instead of just blob-like objects with the uri property.

Additionally, I've took the opportunity to improve FormDatas test suite overall by adding more test cases.

It's worth noting that according to the implementation of URL.createObjectURL, the call may fail if the native blob module is not available. However, I don't know which circumstances determine its availability:

• Is it the native platform?
• Is it the React Native version?

Changelog

[JavaScript] [Added] - Implement FormData.set.
[JavaScript] [Added] - Add support to filename argument on both FormData.set and FormData.append for Blob and File values.

Test Plan

Run the following command at the root of React Native's directory:

npm t -- FormData-test.js

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 6079256

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,899,112	-747
android	hermes	armeabi-v7a	8,403,206	-720
android	hermes	x86	9,385,650	-1,127
android	hermes	x86_64	9,331,050	-1,310
android	jsc	arm64-v8a	10,350,615	-1,067
android	jsc	armeabi-v7a	9,837,813	-1,035
android	jsc	x86	10,398,663	-1,436
android	jsc	x86_64	10,984,315	-1,623

Base commit: 6079256

[hugomrdias]

Any chance we can get some feedback with this ?

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[github-actions]

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