Bicep Expressions should be allowed to be multiline between parentheses

[JustinGrote]

Is your feature request related to a problem? Please describe.
A common feature of languages is the ability for expressions defined in parentheses to be defined on multiple lines. This allows for both better git diff (PRs can be per-property rather than per-line) and readability with complex statements like long formats.

Describe the solution you'd like

How it works today

output fgaManagementSSHConfig string = format(fgManagementSSHConfigTemplate, fortigateA.outputs.fgName, fqdn, fgaManagementSshPort, adminUsername)

How it should be able to work

output fgaManagementSSHConfig string = format(
  fgManagementSSHConfigTemplate, 
  fortigateA.outputs.fgName, 
  fqdn, 
  fgaManagementSshPort, 
  adminUsername
)

[JustinGrote]

Dupe of #146