Move adapter to mui theme

[dmtrKovalenko]

A part of vNext #1293

User facing changes

No more MuiPickersUtilsProvider . Utils are coming from material-ui-theme

-<MuiPickersUtilsProvider locale={ru} utils={DateFnsUtils}>
- <ThemeProvider theme={createMuiTheme({ ... })}>
-    ...
-  </ThemeProvider>
-</MuiPickersUtilsProvider>
+ <ThemeProvider theme={createMuiTheme({  dateAdapter: new DateFnsUtils({ locale: ru }), ... })}>
+    ...
+  </ThemeProvider>

Blocked by https://github.com/mui-org/material-ui/pull/19542

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[cypress]

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Test summary

37 • 1 • 0 • 14

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Run details

Project	material-ui-pickers
Status	Failed
Commit	a597ab0
Started	Feb 3, 2020 12:54 PM
Ended	Feb 3, 2020 12:55 PM
Duration	01:02 💡
OS	Linux Debian - 9.8
Browser	Electron 61

View run in Cypress Dashboard ➡️

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Failures

	e2e/integration/DatePicker.spec.ts ⏯		1
1	DatePicker > Mobile DatePicker > Should open date picker on 01-01-2018

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