matrix_sdk examples: set `#![type_length_limit = "1075569"]`

Some examples no longer build after the following commits, set a
bigger-than-default type_length_limit to let tests pass.

The exceptions are not necessary on nightly and can be removed again
after https://github.com/rust-lang/rust/issues/54540 is fixed.

matrix_sdk/examples/command_bot.rs

@@ -1,3 +1,7 @@
+// allow biggr types until rustc fix, consider removing after new rust
+// stable release. see https://github.com/rust-lang/rust/issues/54540
+#![type_length_limit = "1075569"]
+
 use std::{env, process::exit};
 
 use matrix_sdk::{

matrix_sdk/examples/image_bot.rs

@@ -1,3 +1,7 @@
+// allow biggr types until rustc fix, consider removing after new rust
+// stable release. see https://github.com/rust-lang/rust/issues/54540
+#![type_length_limit = "1075569"]
+
 use std::{
     env,
     fs::File,