[styles] Add a new injectFirst prop

[oliviertassinari]

One slice of #14999. The property should be enough for 80% of the cases:

 import React from "react";
 import { render } from "react-dom";
-import { create } from "jss";
-import { StylesProvider, jssPreset } from '@material-ui/styles';
+import { StylesProvider } from '@material-ui/styles';
 import StyledComponentsButton from "./StyledComponentsButton";

-const styleNode = document.createComment("insertion-point-jss");
-document.head.insertBefore(styleNode, document.head.firstChild);
-
-const jss = create({
-  ...jssPreset(),
-  insertionPoint: "insertion-point-jss"
-});
-
 const App = () => (
-  <StylesProvider jss={jss}>
+  <StylesProvider injectFirst>
     <StyledComponentsButton />
   </StylesProvider>
 );

[mui-pr-bot]

@material-ui/core: parsed: +0.09% , gzip: +0.17%
@material-ui/lab: parsed: +0.21% , gzip: +0.35%
@material-ui/styles: parsed: +0.61% , gzip: +0.85%

Details of bundle changes.

Comparing: e6594d2...addb1ac

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.09% 🔺	+0.17% 🔺	352,645	352,964	90,524	90,677
@material-ui/core/Paper	+0.47% 🔺	+0.71% 🔺	67,382	67,701	19,709	19,849
@material-ui/core/Paper.esm	+0.52% 🔺	+0.84% 🔺	61,143	61,462	18,799	18,957
@material-ui/core/Popper	0.00%	0.00%	30,460	30,460	10,527	10,527
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	17,384	17,384	5,727	5,727
@material-ui/core/useMediaQuery	0.00%	0.00%	2,469	2,469	1,038	1,038
@material-ui/lab	+0.21% 🔺	+0.35% 🔺	152,123	152,442	44,511	44,666
@material-ui/styles	+0.61% 🔺	+0.85% 🔺	52,565	52,884	15,330	15,461
@material-ui/system	0.00%	0.00%	17,138	17,138	4,519	4,519
Button	+0.35% 🔺	+0.64% 🔺	90,889	91,208	26,921	27,092
Modal	+0.38% 🔺	+0.61% 🔺	84,633	84,952	25,232	25,387
colorManipulator	0.00%	0.00%	3,232	3,232	1,300	1,300
docs.landing	0.00%	0.00%	49,958	49,958	10,837	10,837
docs.main	+0.05% 🔺	+0.06% 🔺	649,537	649,856	201,606	201,717
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	301,793	301,793	83,744	83,744

Generated by 🚫 dangerJS against addb1ac