fix for NamedAgg in agg and aggregate in pandas

[bschnurr]

agg = aggregate

pandas source
https://github.com/pandas-dev/pandas/blob/da0156a302f3f7c25bfee0b410bb23865b76f3dd/pandas/core/groupby/generic.py#L247

import pandas as pd

df_groups = pd.DataFrame().groupby("X")
reveal_type(df_groups)  # DataFrameGroupBy

df_groups.agg(x=pd.NamedAgg("a", "count"))
df_groups.agg(x=pd.NamedAgg("a", "count"), y=pd.NamedAgg("b", "count"))
df_groups.aggregate(x=pd.NamedAgg("a", "count"), y=pd.NamedAgg("b", "count"))

[gramster]

We should probably just add a agg = aggregate line and remove the duplicate signatures. E.g. like here:

python-type-stubs/pandas/core/resample.pyi

Line 27 in 870c0ed

agg = aggregate

[bschnurr]

hmm. downside is our hover is broken
agg

aggregate

[bschnurr]

for now i want to keep it separated