feat: isolates for heavy computation

[Vinzent03]

I copied the compute function from flutter foundation and removed useless code.

Shall we close the following issues, or wait unitl the other packages use isolates too? Is that even necessary? supabase-community/supabase-flutter/issues/150 supabase-community/supabase-flutter/issues/77

[bdlukaa]

Decode should be taken into consideration

• https://github.com/supabase-community/postgrest-dart/blob/master/lib/src/postgrest_builder.dart#L194
• https://github.com/supabase-community/postgrest-dart/blob/master/lib/src/postgrest_builder.dart#L221

[Vinzent03]

Thanks for quick check. I know, but I'm still in testing, because I need the docker image here on GitHub actions. In addition, I don't get the analyzer warning locally.

[bdlukaa]

In addition, I don't get the analyzer warning locally.

Try to restart your IDE

[Vinzent03]

Already tried that 😉. I even checked via raw dart analyze. Fixed it now by upgrading dart to 2.18 via beta channel.