Supersedes #12359

This PR adds a new property to functions - FunctionCollationHandling. This can be used to handle collations across different functions in an easy way. There are three settings:

• PROPAGATE_COLLATIONS (default): Propagate collations, but do not apply them. This means that if the function returns VARCHAR, and any of the input arguments are VARCHAR, the return type will inherit the collations of the input arguments.
• PUSH_COMBINABLE_COLLATIONS: Propagates collations and applies combinable collations prior to calling the function. Combinable collations are "simple" collations like nocase and noaccent, but not icu collations that are more complex.
• IGNORE_COLLATIONS: Ignore collations entirely.

PUSH_COMBINABLE_COLLATIONS is used for various functions, e.g. contains, starts_with, glob, like, etc:

D SELECT 'hello' COLLATE NOCASE LIKE '%HEL%' AS result;
┌─────────┐
│ result  │
│ boolean │
├─────────┤
│ true    │
└─────────┘