fix: files ls should return string (#3352)

Supersedes #3345 #2939
Fixes #3330 #2948

BREAKING CHANGE: types returned by `ipfs.files.ls` are now strings, in line with the docs but different to previous behaviour

Co-authored-by: Geoffrey Cohler <g.cohler@computer.org>

src/files/ls.js

@@ -43,7 +43,13 @@ module.exports = configure(api => {
 })
 
 function toCoreInterface (entry) {
-  if (entry.hash) entry.cid = new CID(entry.hash)
+  if (entry.hash) {
+    entry.cid = new CID(entry.hash)
+  }
+
   delete entry.hash
+
+  entry.type = entry.type === 1 ? 'directory' : 'file'
+
   return entry
 }