Add private MEV embedded support

src/offline_data.nim

@@ -1,11 +1,15 @@
 import std/os
 
-template embeddedTranslationData*(name: static[string]): string =
+template translationDataPath(name: static[string], visibility: static[string]): string =
   const dataRoot = currentSourcePath().parentDir.parentDir / "data"
-  const privatePath = dataRoot / "private" / (name & ".tsv")
-  const publicPath = dataRoot / "public" / (name & ".tsv")
+  dataRoot / visibility / (name & ".tsv")
 
-  when fileExists(privatePath):
-    staticRead(privatePath)
+template hasEmbeddedTranslationData*(name: static[string]): bool =
+  fileExists(translationDataPath(name, "private")) or
+    fileExists(translationDataPath(name, "public"))
+
+template embeddedTranslationData*(name: static[string]): string =
+  when fileExists(translationDataPath(name, "private")):
+    staticRead(translationDataPath(name, "private"))
   else:
-    staticRead(publicPath)
+    staticRead(translationDataPath(name, "public"))