Escape URI components for URLSearchParams

[n9iels]

Description

Currently when using URLSearchParams the given values are not encoded (escaped). A comment in the current implementation says that this will not work due to Unicode issues.

react-native/Libraries/Blob/URL.js

Line 55 in cd347a7

// The reference code bloat comes from Unicode issues with URLs, so those won't work here.

I don't know the ins and outs of that particular issue, but I do think that at least escaping URI components (?,=,/,&,:) is a good idea. I understand that only escaping those characters and not UTF-8 characters can be seen as a "half" solution. However the current implementation of URLSearchParams is not very useful at all. At lease escaping those URI components makes it a lot more useful, and overall a lot safer to use, in situation where no UTF-8 chars are involved.

React Native version:

System:
OS: Linux 5.3 Ubuntu 18.04.4 LTS (Bionic Beaver)
CPU: (4) x64 Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz
Memory: 11.28 GB / 15.58 GB
Shell: 5.4.2 - /usr/bin/zsh
Binaries:
Node: 12.16.3 - /usr/bin/node
npm: 6.14.5 - ~/.npm-global/bin/npm
npmPackages:
react: 16.9.0 => 16.9.0
react-native: https://github.com/expo/react-native/archive/sdk-36.0.1.tar.gz => 0.61.4

[github-actions]

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ℹ️	Your issue may be missing information about your development environment. You can obtain the missing information by running react-native info in a console.

[n9iels]

Environment information is already given. What "Author feedback" does it need?

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as a "Discussion" or add it to the "Backlog" and I will leave it open. Thank you for your contributions.

[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.