fix or document id escaping for ST_EstimatedExtent params

[Yuri]

Function ST_EstimatedExtent - ​https://postgis.net/docs/ST_EstimatedExtent.html has an usual param pattern - it requires schema, table, and geometry columns to be strings in some uncertain escaping - later it gets used directly without quotes in an internal schema/table identity lookup. (uncertain)

As the result, it is not clear what escaping is needed in "complex" cases. Moreover, I suspect there might be a security bug here too, but not certain.

I could not get this function to run for this (convoluted) case.

CREATE SCHEMA """Quotes' and Space.Dot.";

CREATE TABLE """Quotes' and Space.Dot.".". Points"" 'quote"
(
    "' id '"      SERIAL PRIMARY KEY,
    ".namE "      TEXT,
    ". '""Geom""" GEOMETRY(POINT, 4326)
);

INSERT INTO """Quotes' and Space.Dot.".". Points"" 'quote"
values (1, '02daedc70702ec68753fde38351f5d9d', '0101000020E610000050C4D38CE9DA61401EFC0EC7C3DA2740'),
       (2, '7418427ba8a960c3661235f47cc13d46', '0101000020E6100000CC2F4170E9DA6140DEDB02B581DA2740');

CREATE INDEX ON """Quotes' and Space.Dot.".". Points"" 'quote" USING GIST (". '""Geom""");

SELECT ST_EstimatedExtent(?, ?, ?) as bounds;