chore(schema-compiler): Make cube joins to be an array instead of hashmap

[KSDaemon]

• more types in CubeSymbols
• change joins schema in Validator
• specify type for accessPolicy
• make prepareJoins() aware of arrays
• make joins in CubeSymbols / CubeEvaluator as array instead of hashmap
• update JoinGraph to treat joins as array instead of hashmap
• fix CubePropContextTranspiler to convert joins hashmap into array
• add @types/js-yaml
• make YamlCompiler aware of joins as array
• fix/update snapshots for schema tests
• fix transform yaml joins
• add schema tests for joins as array/object

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet