chore: Reduce messages that reported by analyzers

[filzrev]

This PR intended to reduce messages that are reported by analyzers.
(Currently 2313 messages are reported)

Almost of changes are based on analyzer's code fixer.

And following changes are manually edited.

1. chore: fix ca2012 messages

Add helper methods to wait value task.
Because GetAwaiter().GetResult() is not guaranteed to wait ValueTask completion.

2. chore: fix cs9236 messages

Unroll LINQ query to loops. to avoid following messages.

CS9236: Compiling requires binding the lambda expression at least 1000 times. Consider declaring the lambda expression with explicit parameter types, or if the containing method call is generic, consider using explicit type arguments.