refactor(fs)!: remove read_text_file and write_text_file commands (#3605)

`readTextFile` and `writeTextFile` now go through `read_file` and
`write_file`, so the `allow-read-text-file`, `deny-read-text-file`,
`allow-write-text-file` and `deny-write-text-file` permissions are gone;
grant `fs:allow-read-file` and `fs:allow-write-file` instead.

plugins/fs/build.rs

@@ -86,12 +86,10 @@ const COMMANDS: &[&str] = &[
     "truncate",
     "ftruncate",
     "write",
-    "write_text_file",
     "read_dir",
     "read_file",
     "read",
     "open",
-    "read_text_file",
     "read_text_file_lines_next",
     "seek",
     "stat",