Move Cast out of Storage, new common utils for cast and unary operation.

[jdunkerley]

Pull Request Description

• Remove cast from Storage and move to a new CastOperation.
• Added support for casting to Boolean from a numeric (as per database convention).
• check_cast_compatibility delegate to CastOperation to see if a supported conversion.
• New helper class StorageIterators for building unary operations.
• Remove the AbstractUnary classes.
• Merged IsFinite, IsInfinite and IsNaN to single class.
• Moved all Unary operators to use StorageIterators.
• Will add new helper base classes as operations are built up.

class StorageIterators
  /** Iterate over source, operation's job to add to builder. Use to build Long/Double/Boolean without boxing. */
  <B extends BuilderForType<T>, S, T> ColumnStorage<T> buildOverStorage(
      ColumnStorage<S> source,
      boolean preserveNothing,
      B builder,
      BuildOperation<B, S> operation) {}

  /** Iterate over source, operation's job to add to builder. Use to build Long/Double/Boolean without boxing. */
  <S, T> ColumnStorage<T> mapOverStorage(
      ColumnStorage<S> source,
      boolean preserveNothing,
      BuilderForType<T> builder,
      MapOperation<T, S> operation) {}

Overrides with preseverNothing=true and specialised versions for (map|build)Over(Long|Double|Boolean)Storage

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
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  and
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  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.
• If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries,
  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[AdRiley]

Why the index argument? Struggling to find where we ever use it/

[jdunkerley]

For the framework seemed good to have it as would allow zip operations etc in due course.