Add explicit signatures to some date autofunctions

[xmo-odoo]

Because default_locale is eager, it generates misleading documentation when built (including on the site) as the doc will show the LC_TIME for the machine which built the doc.

An explicit autofunction signature fixes that and provides a more correct view of the signature.

Alternative fix: have dates.LC_TIME be a custom object with a relevant repr e.g.

class _LC(str):
    def __new__(cls, category):
        category = 'LC_' + category
        v = str.__new__(cls, default_locale(category))
        v._category = category
        return v

    def __repr__(self):
        return "default_locale('%s')" % self._category
LC_TIME = _LC('TIME')

[codecov-io]

Codecov Report

Merging #554 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #554   +/-   ##
=======================================
  Coverage   90.22%   90.22%           
=======================================
  Files          24       24           
  Lines        4042     4042           
=======================================
  Hits         3647     3647           
  Misses        395      395

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[akx]

Thank you! 🙇