[SERVER-10911] Add $currentDate update modifier - MongoDB

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Add a new update modifier where the server will fill in the date/timestamp:

Usage:

update({}, {$currentDate: {

    field : true, //new Date()

    field1: {$type: "date"}, //new Date()

    field2: {$type: "timestamp"} //new Timestamp()

}}

depends on

DRIVERS-121 support new update operators

is duplicated by

SERVER-1650 Server Side Timestamps

SERVER-2064 $sysdate for inserts/updates

SERVER-10123 Support Timestamp(0,0) server replace for update (mods)

related to

DOCS-2013 new update operator $currentDate