Compat: map onFocus/onBlur to onfocusin/onfocusout

[developit]

This makes the events bubble, which is React's behavior.

Fixes #1621

[coveralls]

Coverage remained the same at 99.625% when pulling 9ca505f on compat-focus-bubbling into dd1e281 on master.

[github-actions]

Size Change: +60 B (0%)

Total Size: 42.2 kB

Filename	Size	Change
compat/dist/compat.js	3.46 kB	+21 B (0%)
compat/dist/compat.module.js	3.44 kB	+20 B (0%)
compat/dist/compat.umd.js	3.51 kB	+19 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
debug/dist/debug.js	2.99 kB	0 B
debug/dist/debug.module.js	2.98 kB	0 B
debug/dist/debug.umd.js	3.07 kB	0 B
devtools/dist/devtools.js	232 B	0 B
devtools/dist/devtools.module.js	240 B	0 B
devtools/dist/devtools.umd.js	308 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	1.14 kB	0 B
hooks/dist/hooks.module.js	1.16 kB	0 B
hooks/dist/hooks.umd.js	1.22 kB	0 B
jsx-runtime/dist/jsxRuntime.js	317 B	0 B
jsx-runtime/dist/jsxRuntime.module.js	327 B	0 B
jsx-runtime/dist/jsxRuntime.umd.js	395 B	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

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