[FEATURE] Add support for escaped shorthand syntax in fluid (Revision 1)

This change allows to escape the Fluid shorthand syntax with a backslash
to output the text without further evaluation.

Example:

    Hello \{name}

Will be evaluated to:

	Hello {name}

Change-Id: Ife7de6bda3d6d86c1cbc82218cd2732e9ccea5e3
Resolves: #46257
Revision-Id: a953503d6248c6835657f6e7a8279dd0b25b53ad