Initial features needed for Bicep

[SteveL-MSFT]

Summary of the new feature / enhancement

• not()
• or()
• and()
• automatic consumption of .bicep files
• output
• union()
• contains()
• endsWith()
• length()
• utcNow()
• uniqueString()
• empty()
• Copy (aka loops)
• Types
• map() - lambda
• filter() - lambda
• reduce() - lambda
• ARM language v2 support
• flatten() -ARM language v2

Proposed technical implementation details (optional)

No response