fix duplicated symbol in compiled binary (#248)

Author: mcasimir

packages/shell-api/src/enums.ts

@@ -37,7 +37,7 @@ export const DBQuery = {
   Option: DBQueryOption
 };
 
-export const shellApiType = Symbol('shellApiType');
+export const shellApiType = Symbol.for('@@mongosh.shellApiType');
 // TODO: Would require changes to java-shell
 // export const asPrintable = Symbol('asPrintable');
-export const asShellResult = Symbol('asShellResult');
+export const asShellResult = Symbol.for('@@mongosh.asShellResult');