Export Protocol that satisfies both this and the official implementations

[NickCrews]

In ibis-project/ibis#11525, I want to make the library ibis be able to accept templatelib.Template instances.

But, I want that library code to also be able to accept the Template instances from this library. This should be fine since they have the same APIs. But, I want the typing to work. In other words, I would want something like

# ibis/some/library/module.py
from tstrings import PTemplate

def sql_value(template: PTemplate) -> ibis.Value:
    # ibis is able to handle both the official and this implementation since
    # they have the same APIs

# ===================================

# users/main.py
# in user's code they can either use the official implementation, or this backport:
import ibis
my_table = ibis.duckdb.connect("mydb.duckdb").table("my_table")
original_value = my_table.my_timestamp_column

# for users on python <3.14:
from tstrings import t
cast_value = ibis.sql_value(t("CAST({original_value} AT TIME ZONE 'America/Anchorage' AS TIMESTAMP)"))

# for users on python >=3.14
cast_value = ibis.sql_value(t"CAST({original_value} AT TIME ZONE 'America/Anchorage' AS TIMESTAMP)")

Do you have interest in supporting this use case? Does this implementation look good to you? If I submit a PR would you consider it?

Thank you!