Add readonly table provider for Trino

[krinart]

What this PR includes:

• TrinoTableFactory
• Tests (unit + integration)
• Example (under examples)
• Documentation in README

Example:

    let trino_params = to_secret_map(HashMap::from([
        ("host".to_string(), "localhost".to_string()),
        ("port".to_string(), "8080".to_string()),
        ("catalog".to_string(), "tpch".to_string()),
        ("schema".to_string(), "tiny".to_string()),
        ("user".to_string(), "test".to_string()),
        ("sslmode".to_string(), "disabled".to_string()),
    ]));

    let trino_pool = Arc::new(
        TrinoConnectionPool::new(trino_params)
            .await
            .expect("unable to create Trino connection pool"),
    );

    let table_factory = TrinoTableFactory::new(trino_pool.clone());

    let ctx = SessionContext::new();

    ctx.register_table(
        "region",
        table_factory
            .table_provider(TableReference::bare("region"))
            .await
            .expect("failed to register table provider"),
    )
    .expect("failed to register table");

    let df = ctx
        .sql("SELECT * FROM region")
        .await
        .expect("select failed");
    df.show().await.expect("show failed");

Will output:

+-----------+-------------+---------------------------------------------------------------------------------------------------------------------+
| regionkey | name        | comment                                                                                                             |
+-----------+-------------+---------------------------------------------------------------------------------------------------------------------+
| 0         | AFRICA      | lar deposits. blithely final packages cajole. regular waters are final requests. regular accounts are according to  |
| 1         | AMERICA     | hs use ironic, even requests. s                                                                                     |
| 2         | ASIA        | ges. thinly even pinto beans ca                                                                                     |
| 3         | EUROPE      | ly final courts cajole furiously final excuse                                                                       |
| 4         | MIDDLE EAST | uickly special accounts cajole carefully blithely close requests. carefully final asymptotes haggle furiousl        |
+-----------+-------------+---------------------------------------------------------------------------------------------------------------------+

The implemented Trino=>Arrow type mapping

Trino Type	Arrow Type
null	Null
boolean	Boolean
tinyint	Int8
smallint	Int16
integer	Int32
bigint	Int64
real	Float32
double	Float64
varchar	Utf8
char	Utf8
varbinary	Binary
date	Date32
time(second)	Time32(Millisecond)
time(millisecond)	Time32(Millisecond)
time(microsecond)	Time64(microsecond)
time(nanosecond)	Time64(nanosecond)
timestamp(unit)	Timestamp(unit, None)
timestamp(unit) with time zone	Timestamp(unit, Some(tz))
decimal(p,s)	Decimal(p,s)
numeric(p,s)	Decimal(p,s)
array(T)	List<T>
row(...)	Struct