add SQL support for tinyint and unsigned versions of all INTs

[kmitchener]

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Currently there is no SQL support for TINYINT, or the unsigned versions of TINYINT, SMALLINT, INT, and BIGINT.

$ echo "1" > tmp.txt
$ ./target/debug/datafusion-cli.exe
DataFusion CLI v11.0.0
create external table t (c1 tinyint) stored as csv location 'tmp.txt';
NotImplemented("The SQL data type TinyInt(None) is not implemented")
select 1::tinyint;
NotImplemented("Unsupported SQL type TinyInt(None)")
-- or unsigned versions of ints
select 1::int unsigned;
NotImplemented("Unsupported SQL type UnsignedInt(None)")

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I'd like SQL support for TINYINT at least. Does DataFusion want SQL support for the unsigned versions of the rest of the INTs? Postgres doesn't support unsigned ints, but sqlparser-rs already has syntax support for it and there are matching Arrow types.

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