Support datetime.(date|datetime) as a SchemaBase parameter

[dangotbanned]

Target schema (core.DateTime)

core.DateTime / datetime.datetime

• Order, and name of parameters differ
• Milli instead of Micro seconds resolution
• Doesn't really handle timezones, just a utc flag

See #3650 for detail

Current

from datetime import date, datetime

import altair as alt

window_stdlib = (
    datetime(2005, 1, 1).timestamp() * 1e3,
    datetime(2009, 1, 1).timestamp() * 1e3,
)
window_alt = alt.DateTime(year=2005), alt.DateTime(year=2009)

brush = alt.selection_interval(encodings=["x"], value={"x": window_stdlib})
brush = alt.selection_interval(encodings=["x"], value={"x": window_alt})

Goal

Directly addressing #3643, with a simple stdlib solution

window_stdlib = datetime(2005, 1, 1), datetime(2009, 1, 1)

Annotations

• Update generated annotations to include datetime.(date|datetime)
  • Note: won't be operating in the same way as jsonschema_to_python_types
  • Implement a guard (.is_datetime()) in tools.schemapi.utils.SchemaInfo
    • Where the schema permits core.DateTime, always add these primitives
    • Found 58 occurences for r'[/<]DateTime[">]' in vega-lite-schema.json
  • Insert either
    • {"datetime.date", "datetime.datetime"}
    • or a new alias for that union
• Passing suite (29c500c)