feat: add reactStrictMode option to enable strict mode render

[yinm]

What:

Add reactStrictMode option to enable strict mode render

Why:

ref: #338

How:

This PR updates getConfig and configure functions from DTL for handling RTL options (e.g. reactStrictMode).
This PR also wraps UI in render function with React.StrictMode component when reactStrictMode is true.
By default, reactStrictMode is false. (according to #338)

Checklist:

• Documentation added to the
  docs site -> Add reactStrictMode option for RTL testing-library-docs#1318
• Tests
• TypeScript definitions updated
• Ready to be merged
  

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 99a3602:

Sandbox	Source
React	Configuration
react-testing-library-examples	Configuration

[codecov]

Codecov Report

Merging #1241 (a543597) into main (c04b8f0) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1241   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines          192       204   +12     
  Branches        38        42    +4     
=========================================
+ Hits           192       204   +12     

Flag	Coverage Δ
canary	100.00% <100.00%> (ø)
experimental	100.00% <100.00%> (ø)
latest	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/config.js	100.00% <100.00%> (ø)
src/pure.js	100.00% <100.00%> (ø)

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[eps1lon]

Sorry for letting this sit so long. Much appreciated, thanks!

[eps1lon]

Not sure where codecov GH status check is but coverage is at 100%: https://app.codecov.io/github/testing-library/react-testing-library/commit/99a3602cc38c510bcd1546b13056fd70839feee9

[eps1lon]

@all-contributors add @yinm for code

[allcontributors]

@eps1lon

I've put up a pull request to add @yinm! 🎉