Support pasting page breaks

[mlewand]

Is this a bug report or feature request?

🆕 Feature request

💻 Version of CKEditor

CKEditor v5 @ 12.4.0

📋 Steps to reproduce

Once #1194 is done we should add a converter for page breaks coming from MS Office.

To save you the trouble I'll paste here an example markup that is placed in Chrome from Word 2013 (note it would be nice to verify with the latest release, didn't had one at hand now):

<p class=MsoNormal>First line, followed by break line:<o:p></o:p>
</p>

<span style='font-size:11.0pt;line-height:107%;font-family:"Calibri",sans-serif;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"MS Mincho";
mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;
mso-ansi-language:EN-US;mso-fareast-language:JA;mso-bidi-language:AR-SA'><br clear=all
		style='mso-special-character:line-break;page-break-before:always'>
</span>

<p class=MsoNormal>
	<o:p>&nbsp;</o:p>
</p>

So it boils down to recognizing <br clear=all style='mso-special-character:line-break;page-break-before:always'>.

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