Optimize compile time by removing anonymous subclass

[jatcwang]

https://oyvindberg.github.io/typo/blog/the-cost-of-implicits/#avoiding-anonymous-classes

For example, we can try replacing various new Read (..) {} in

doobie/modules/core/src/main/scala/doobie/util/read.scala

Line 90 in c6a8a10

new Read(List((ev, Nullable)), ev.unsafeGetNullable) {}

Will be cool to verify the impact too. Here's his benchmark code

https://github.com/oyvindberg/typo/blob/53539fa8205327828958748dbd00b78e13bf6813/typo-scripts/src/scala/scripts/CompileBenchmark.scala