ast module classes missing __text_signature__ attribute

[dce13233-e405-4731-8614-ecd451b89db3]

BPO	45303
Nosy	@terryjreedy, @larryhastings, @xloem

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['interpreter-core', 'type-feature', 'library', 'expert-argument-clinic', '3.11'] title = 'ast module classes missing __text_signature__ attribute' updated_at = user = 'https://github.com/xloem' ``` bugs.python.org fields: ```python activity = actor = 'terry.reedy' assignee = 'none' closed = False closed_date = None closer = None components = ['Interpreter Core', 'Library (Lib)', 'Argument Clinic'] creation = creator = 'xloem' dependencies = [] files = [] hgrepos = [] issue_num = 45303 keywords = [] message_count = 2.0 messages = ['402728', '403040'] nosy_count = 3.0 nosy_names = ['terry.reedy', 'larry', 'xloem'] pr_nums = [] priority = 'normal' resolution = None stage = 'test needed' status = 'open' superseder = None type = 'enhancement' url = 'https://bugs.python.org/issue45303' versions = ['Python 3.11'] ```

[dce13233-e405-4731-8614-ecd451b89db3]

The ast module has no signature information on its types. The types are generated in a uniform way, so it should be reasonable to add __text_signature or __signature fields to all of them at once.

[terryjreedy]

I believe that multiple modules have not yet been converted to use argument clinic. (I marked 'test needed' but am not sure if this attribute is tested.) I don't think that I would put ast as highest priority, although it might be easiest.