tofu: support class properties

[boneskull]

It looks like lavamoat-tofu is now considering some things to be globals which were not previously considered globals, and by all accounts aren't actually globals. This is likely related to changes merged in #809 or #810

Ex: https://github.com/MetaMask/metamask-extension/pull/23423/files#diff-7c92d6ad2a8a25dea901b4d2d1399d086251e96be25bafbbecf7389c95d92be4R2224-R2245

Diagnose & fix

This is because lavamoat-tofu does not know anything about ClassProperty-type Nodes, e.g.:

class Foo {
  bar;
  baz = 1;
}

Ensure ClassProperty-type Nodes are not considered globals in lavamoat-tofu.