Stack overflow achieved with left recursion undetected

[AntoineGuilminCrepon]

Describe the bug
Managed to create a stack overflow by avoiding the "anti-left-recursive" check.

To Reproduce

• Create a left-recursive grammar rule (e.g. expr = { expr ~ infix ~ expr })
• Add a predicate checking an obviously true (or obviously false) statement (e.g expr = { !(EOI) ~ expr ~ infix ~ expr })
• pest_derive does not trigger left-recursion, and let you construct a left-recursive parser.

Expected behavior
pest-derive should ignore predicates for checking left-recursion, since those don't consume any character.

[tomtau]

@Tartasprint was collecting these edge cases: #851

not sure if this one falls under examples there

[Tartasprint]

I can give a look. Sorry I never finished what I started. To be honest I don't remember much, except I was pretty sure I documented all edge cases at the time. But I'll try again.