Refactor map(any) variables

[horiagunica]

Is your feature request related to a problem?

Currently map variables have any structure which does not constrain the values within the map.

Describe the solution you'd like

Use object({}) and define variable constraints - for example :

  type = object({
    vnet_name                    = string
    resource_group_name          = string
    name                         = optional(string)
    allow_virtual_network_access = bool
    allow_forwarded_traffic      = bool
    allow_gateway_transit        = bool
    use_remote_gateways          = bool
  })

Describe alternatives you've considered.

No response

Additional context

If we are going to use this implementation - we would require to bump the TF version to 1.3 minimum so that we can use optional values within the map object without constraints : https://medium.com/@apr_1985/terraform-optional-attributes-and-defaults-d73643185341

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[FoSix]

superseded by #307