Support string interpolation in Puppet

[pyrmont]

Is your enhancement request related to a problem? Please describe.
The Puppet lexer does not support string interpolation (see this comment).

Describe the solution you'd like
The Puppet lexer would support string interpolation. The below example should be lexed correctly:

notice("This computer has the following partitions:\n${facts["partitions"].map |$k,$v| { "$k mounted at ${v["mount"]} (${v["size"]})\n" }.join}")

[stale]

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