Support for var in record patterns

[emandirola]

Before this PR

palantir fails when parsing source files with var inside a record pattern.
e.g.

if (o instanceof Record(var i)) {}
switch (o) {
  case Record(var i):
}

After this PR

Added support for var in record patterns.
The AST explicitly unsets the type when it sees var.
We may assume that's the reason type is null, so we just output "var".
Fixes #1309

Possible downsides?

The type is set to null when the token found is var, might change in the future?
There's a declaredUsingVar but it's false, might be broken (including java 24)

[changelog-app]

Generate changelog in changelog/@unreleased

Type (Select exactly one)

• Feature (Adding new functionality)
• Improvement (Improving existing functionality)
• Fix (Fixing an issue with existing functionality)
• Break (Creating a new major version by breaking public APIs)
• Deprecation (Removing functionality in a non-breaking way)
• Migration (Automatically moving data/functionality to a new system)

Description

Support for var in record patterns

Check the box to generate changelog(s)

• Generate changelog entry

[CRogers]

👍

[felixdesouza]

👍

[autorelease3]

Released 2.68.0