Reduced dynamic calls

• Reduce use of dynamic calls in generated operator== when there are
  functions: only use dynamic calls if the class also has type parameters.

Require `analyzer ^10.0.0`

• Require analyzer ^10.0.0, stop using removed and deprecated methods from
  earlier versions.

Allow analyzer 10.0.0

• Allow analyzer 10.0.0.

Allow `analyzer 9.0.0`

• Allow analyzer 9.0.0.

Update dependencies

• Require analyzer ^8.0.0.
• Allow built_value_generator to use build 4.0.0.
• Allow built_value_generator to use source_gen 4.0.0.

Use `build 3.0.0`

• Use build ^3.0.0.
• Use source_gen ^3.0.0.

Use `build ^3.0.0-dev`

• Use build ^3.0.0-dev.
• Use source_gen ^3.0.0-dev.

Serialize mutable collections

• Add mutable collection serializers so built_value can serialize List,
  Set and Map. It's still recommended to avoid mutable collections inside
  value types as they break hashing, comparison and caching; the intended use
  case is that you have one top level mutable collection of your immutable
  value types.

Improvements to generation

• Stop generating unnecessary new keywords.
• Stop generating explicit null checks in constructors: these are not needed
  with sound null safety.
• Stop generating checks for dynamic in generics in constructors: accidental
  use of dynamic is better avoided with lints than a runtime check.

Improved build performance

• Generate code that formats faster with current "short" style. Both versions
  are fast with the coming "tall" style.
• Mark @nullable deprecated: it does nothing and should not be used.

The build is almost 2x faster than before.