[API Proposal]: Add Interval to System.Data.DbType

[jogibear9988]

Background and motivation

As many Databases support a native Interval Type, we should add Interval as a DbType.

See also:
#30677
maybe this should be resolved as well
and also:
#41026

API Proposal

namespace System.Collections.Generic;

public class DbType
{
      ....,
      Interval,
}

API Usage

// Fancy the value
var c = DbType.Interval

Alternative Designs

No response

Risks

See none, the enum was also changed from Net Framework 1.1 to Net 2

[jogibear9988]

Databases with native interval support:

Postgres (https://neon.tech/postgresql/postgresql-tutorial/postgresql-interval),
Oracle https://docs.oracle.com/cd/B13789_01/win.101/b10118/o4o01800.htm
Clickhouse https://clickhouse.com/docs/sql-reference/data-types/special-data-types/interval

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