Add React "secret or fired" shim for react-relay

[marvinhagemeister]

This PR adds support for react-relay in our compatibility layer. It was tested with the official example todo demo app.

__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED

So far it is the first library that makes use of the famous __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED variable by React. The only other usage I've seen so far is in the react-devtools codebase.

Fixes #411 .

Note that the original issue was for an older version of react-relay. I'm not able to reproduce the mentioned issue with the latest version anymore.

[github-actions]

Size Change: +370 B (0%)

Total Size: 40.9 kB

Filename	Size	Change
compat/dist/compat.js	3.38 kB	+126 B (3%)
compat/dist/compat.module.js	3.4 kB	+116 B (3%)
compat/dist/compat.umd.js	3.44 kB	+128 B (3%)

ℹ️ View Unchanged

Filename	Size	Change
debug/dist/debug.js	3.06 kB	0 B
debug/dist/debug.module.js	3.06 kB	0 B
debug/dist/debug.umd.js	3.15 kB	0 B
devtools/dist/devtools.js	185 B	0 B
devtools/dist/devtools.module.js	195 B	0 B
devtools/dist/devtools.umd.js	260 B	0 B
dist/preact.js	3.97 kB	0 B
dist/preact.min.js	4 kB	0 B
dist/preact.module.js	3.99 kB	0 B
dist/preact.umd.js	4.03 kB	0 B
hooks/dist/hooks.js	1.09 kB	0 B
hooks/dist/hooks.module.js	1.11 kB	0 B
hooks/dist/hooks.umd.js	1.17 kB	0 B
test-utils/dist/testUtils.js	437 B	0 B
test-utils/dist/testUtils.module.js	439 B	0 B
test-utils/dist/testUtils.umd.js	515 B	0 B

_{compressed-size-action}

[coveralls]

Coverage increased (+0.002%) to 99.804% when pulling 1052866 on relay-support into 7eb87b7 on master.