[locale] bo: Add bo-IN locale and align bo with CLDR

[JLHwung]

According to Unicode CLDR (here), the bo will have dateFormat as

<availableFormats>
<dateFormatItem id="GyMMM">G y LLLL</dateFormatItem>
<dateFormatItem id="MMMd">MMMཚེས་d</dateFormatItem>
<dateFormatItem id="MMMEd">MMMཚེས་d, E</dateFormatItem>
<dateFormatItem id="MMMMd">MMMMའི་ཚེས་d</dateFormatItem>
<dateFormatItem id="yMMM">y LLL</dateFormatItem>
<dateFormatItem id="yMMMd">y ལོའི་MMMཚེས་d</dateFormatItem>
<dateFormatItem id="yMMMMd">སྤྱི་ལོ་y MMMMའི་ཚེས་d</dateFormatItem>
</availableFormats>

which is bo-CN actually from the YMD dateFormat order. The current longDateFormat of bo,

longDateFormat : {
        LT : 'A h:mm',
        LTS : 'A h:mm:ss',
        L : 'DD/MM/YYYY',
        LL : 'D MMMM YYYY',
        LLL : 'D MMMM YYYY, A h:mm',
        LLLL : 'dddd, D MMMM YYYY, A h:mm'
    }

corresponds to bo-IN after I review the DMY date format on CLDR hi.

I suggest we rename bo locale to bo-IN and align bo date accordingly.

This will break locale name compatibility and we should document that the user of bo locale should choose between bo and bo-IN.

cc @vajradog

[ichernev]

@JLHwung I'd be happy to merge something that is in line with CLDR.

[marwahaha]

closing as part of #4949