Adding AVM module support for Bicep

[remyblok]

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Renovate support bicep files, but only resource references in these files. I use a lot of Azure Verified Modules (AVM), which is a public registry of modules that can be used in bicep. Modules work different from resource and are versioned differently.

I'd like to add a new data source for bicep that queries the AVM modules in the public registry. The new data source is to be used in the existing bicep manager.