Added DBC format support for databricks_notebook

[nfx]

Fixes #988

locals {
  url = "https://files/XYZ.dbc"
}

// though this can be replaced with data http & local file
resource "null_resource" "dbc" {
  triggers = {
    on_version_change = local.url
  }

  provisioner "local-exec" {
    command = "curl -o ${path.root}/.terraform/import.dbc ${local.url}"
  }

  provisioner "local-exec" {
    when    = destroy
    command = "rm ${path.root}/.terraform/import.dbc"
  }
}

// "downloaded_file" module then... or hack with https://registry.terraform.io/providers/anschoewe/curl/latest/docs/data-sources/curl
data "null_data_source" "values" {
  inputs = {
    x = "${path.root}/.terraform/import.dbc"
  }
  depends_on = [null_resource.dbc]
}

data "databricks_current_user" "me" {
}

resource "databricks_notebook" "lesson" {
  source = data.null_data_source.values.outputs["x"]
  path = "${data.databricks_current_user.me.home}/Foo" 
}

[codecov]

Codecov Report

Merging #989 (74c0c8b) into master (097c9fe) will increase coverage by 0.05%.
The diff coverage is 94.28%.

@@            Coverage Diff             @@
##           master     #989      +/-   ##
==========================================
+ Coverage   85.79%   85.85%   +0.05%     
==========================================
  Files         103      103              
  Lines        9291     9301      +10     
==========================================
+ Hits         7971     7985      +14     
+ Misses        802      799       -3     
+ Partials      518      517       -1     

Impacted Files	Coverage Δ
workspace/data_notebook_paths.go	86.66% <ø> (+18.24%)	⬆️
workspace/file_resource.go	96.29% <ø> (ø)
workspace/resource_notebook.go	88.97% <93.54%> (+1.36%)	⬆️
workspace/data_notebook.go	88.67% <100.00%> (ø)