Make `COLUMN_DOCUMENT_ID` optional when using with `listFiles`

[alexrintt]

Fix #50.

Since this column is required to list all files, we need to query it even when not explicity requested by the plugin user.

• [x] Fix the bug at:

https://github.com/lakscastro/shared-storage/blob/1bfeb88df69938c62d7709861cc426ec71515f3c/android/src/main/kotlin/io/lakscastro/sharedstorage/storageaccessframework/lib/DocumentCommon.kt#L211-L212

• [x] Update docs to add a warning like: 'Optional column, will be queried implicity'.
• [x] Add bug reporter (@EternityForest) as contributor.