Create service to populate Imdb data collection within mongo

We can use this collection as an alternative source to lookup imdb ids, which would be executed before name_to_imdb is called in the consumer.

src/metadata/Extensions/EnvironmentExtensions.cs

@@ -0,0 +1,68 @@
+namespace Metadata.Extensions;
+
+public static class EnvironmentExtensions
+{
+    public static bool GetEnvironmentVariableAsBool(this string prefix, string varName, bool fallback = false)
+    {
+        var fullVarName = GetFullVariableName(prefix, varName);
+        
+        var str = Environment.GetEnvironmentVariable(fullVarName);
+        
+        if (string.IsNullOrEmpty(str))
+        {
+            return fallback;
+        }
+
+        return str.Trim().ToLower() switch
+        {
+            "true" => true,
+            "yes" => true,
+            "1" => true,
+            _ => false,
+        };
+    }
+    
+    public static int GetEnvironmentVariableAsInt(this string prefix, string varName, int fallback = 0)
+    {
+        var fullVarName = GetFullVariableName(prefix, varName);
+        
+        var str = Environment.GetEnvironmentVariable(fullVarName);
+
+        if (string.IsNullOrEmpty(str))
+        {
+            return fallback;
+        }
+
+        return int.TryParse(str, out var result) ? result : fallback;
+    }
+    
+    public static string GetRequiredEnvironmentVariableAsString(this string prefix, string varName)
+    {
+        var fullVarName = GetFullVariableName(prefix, varName);
+        
+        var str = Environment.GetEnvironmentVariable(fullVarName);
+
+        if (string.IsNullOrEmpty(str))
+        {
+            throw new InvalidOperationException($"Environment variable {fullVarName} is not set");
+        }
+
+        return str;
+    }
+    
+    public static string GetOptionalEnvironmentVariableAsString(this string prefix, string varName, string? fallback = null)
+    {
+        var fullVarName = GetFullVariableName(prefix, varName);
+        
+        var str = Environment.GetEnvironmentVariable(fullVarName);
+
+        if (string.IsNullOrEmpty(str))
+        {
+            return fallback;
+        }
+
+        return str;
+    }
+    
+    private static string GetFullVariableName(string prefix, string varName) => $"{prefix}_{varName}";
+}