Simplify array functions

[dain]

Description

• Add BLOCK_BUILDER return convention that writes the result directly to a BlockBuilder
• Add READ_VALUE operator that can read a value from any argument convention to any return convention
• Using the above two techniques, most array functions with an implementation per stack type are converted to a simple single generic implementation
• Migrate more array functions from PageBuilder cache to use the simpler BufferedArrayValueBuilder

Release notes

(X) Release notes are required, with the following suggested text:

# Section
* Add `BLOCK_BUILDER` return convention that writes the function result directly to a `BlockBuilder`. ({issue}`18094`)
* Add `READ_VALUE` operator that can read a value from any argument convention to any return convention.  ({issue}`18094`)

[electrum]

Typo "BlockBuild" in first commit description

[electrum]

We normally use AssertionError, but this seems better. We should probably switch to it for static initializers.

[dain]

I copied this from somewhere else, but I commonly see RuntimeException for these... we should pick one

[electrum]

You can inline this now that there is only one usage. Also, consider converting to checkCondition

[dain]

This is actually referenced from the ExpressionInterpreter