Change Macros to Support Rust Analyzer Autocomplete

[jbuckmccready]

When using the stream! or try_stream! macros autocomplete with rust analyzer works fine until a yield statement is written, this is due to the macro no longer expanding if there is any invalid rust (but only once a yield statement has been written). See the rust analyzer issue here explaining in more detail how autocomplete fails when macros fail to expand (specifically for this crate's macros): rust-lang/rust-analyzer#12759

I have no experience writing proc macros, I'm wondering is it possible to change the way the proc macros are written to always expand even if there is a yield statement and the Rust code is invalid? This would allow rust analyzer auto complete to function properly in all cases. I tested and noticed the tokio select! macro seems to consistently expand which allows autocomplete to function normally.

[taiki-e]

Does #68 's trick work?

In any case, #74 should solve this issue.

[jbuckmccready]

Parentheses as mentioned in #68 unfortunately doesn't fix the autocomplete - but good to know for formatting.