Add support for jinja templates

[rakhinskiy]

Is your feature request related to a problem? Please describe.

Can't combine jinja template with rpm spec plugins

Describe the solution you'd like

Jinja 2 template plugin in PyCharm can be used with "Template data language"
I wan't to combine jinja and rpm specs, but when a use for example
%global version {{ pkg_version }}
I receive error from plugin

RpmSpecTokenType.%, RpmSpecTokenType.%%, RpmSpecTokenType.(, RpmSpecTokenType.), RpmSpecTokenType.-, RpmSpecTokenType.:, RpmSpecTokenType.<, RpmSpecTokenType.>, RpmSpecTokenType.BOOL_LITERAL, RpmSpecTokenType.CODE, RpmSpecTokenType.FLOAT_LITERAL, RpmSpecTokenType.IDENTIFIER, RpmSpecTokenType.INTEGER_LITERAL, RpmSpecTokenType.\ or RpmSpecTokenType.{ expected

Can you add support for jinja like #5
Or maybe exclude {{ }} from errors

Describe alternatives you've considered

No response

Additional context

No response

[dvershinin]

+1. This would be very handy for templated .spec files. I use such template.