[core] Re-export all the styles modules from core

[merceyz]

• I have followed (at least) the PR section of the contributing guide.

• Re-export StylesProvider from @material-ui/styles/StylesProvider

• Update @material-ui/styles to export everything from StylesProvider

@oliviertassinari Edit:

• Re-export all the styles modules from core

Closes #17418

[mui-pr-bot]

@material-ui/core: parsed: +0.32% , gzip: +0.31%

Details of bundle changes.

Comparing: f25c643...093d2cf

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.32% 🔺	+0.31% 🔺	332,485	333,558	90,719	91,000
@material-ui/core/Paper	+0.17% 🔺	-0.08%	68,882	68,996	20,527	20,511
@material-ui/core/Paper.esm	+0.01% 🔺	-0.01%	62,319	62,324	19,264	19,263
@material-ui/core/Popper	0.00%	+0.07% 🔺	28,405	28,405	10,172	10,179
@material-ui/core/Textarea	0.00%	-0.09%	5,082	5,082	2,136	2,134
@material-ui/core/TrapFocus	0.00%	+0.06% 🔺	3,766	3,766	1,596	1,597
@material-ui/core/styles/createMuiTheme	+0.02% 🔺	+0.05% 🔺	16,348	16,351	5,818	5,821
@material-ui/core/useMediaQuery	0.00%	+0.19% 🔺	2,488	2,488	1,050	1,052
@material-ui/lab	0.00%	+0.03% 🔺	143,352	143,353	43,792	43,804
@material-ui/styles	+0.17% 🔺	-0.08%	51,641	51,727	15,353	15,340
@material-ui/system	+0.01% 🔺	-0.05%	15,581	15,583	4,341	4,339
Button	0.00%	+0.05% 🔺	78,719	78,720	24,031	24,043
Modal	0.00%	0.00%	14,542	14,542	5,113	5,113
Portal	0.00%	-0.15%	2,907	2,907	1,318	1,316
Rating	0.00%	+0.05% 🔺	70,185	70,186	21,915	21,926
Slider	0.00%	+0.04% 🔺	75,326	75,327	23,248	23,258
colorManipulator	0.00%	0.00%	3,835	3,835	1,519	1,519
docs.landing	0.00%	0.00%	54,267	54,267	14,344	14,344
docs.main	+0.02% 🔺	0.00%	587,126	587,261	187,881	187,885
packages/material-ui/build/umd/material-ui.production.min.js	+0.40% 🔺	+0.45% 🔺	303,304	304,531	87,264	87,661

Generated by 🚫 dangerJS against 093d2cf

[oliviertassinari]

This solves part of #17387 and #15867.

[oliviertassinari]

@merceyz @mbrookes I have updated the pull request to handle the "export side" of #17387 (comment).
It should be a preliminary change to #17447. Are you happy with the changes?

There is one concern I'm not sure how we should handle: MuiThemeProvider vs ThemeProvider. So far the approach is to keep them scoped respectively to core and styles.

[oliviertassinari]

@merceyz I'm sorry it took so long to come up with a solid path forward. I know it can be frustrating. We appreciate the care, thank you!

The next important topic we have left aside and that we need to move forward is the Babel plugin effort. I think that publishing our own Babel plugin is actually a good idea. It would allow us new doors. The first immediate advantage will be a configuration less support for option 2 of treeshaking.

Another effort that you started and that was very interesting is the migration of the props definitions to TypeScript.