## What changes were proposed in this pull request?
In the PR, I propose to make creation of typed Literals `TIMESTAMP` and `DATE` consistent to the `Cast` expression. More precisely, reusing the `Cast` expression in the type constructors. In this way, it allows:
- To use the same calendar in parsing methods
- To support the same set of timestamp/date patterns
For example, creating timestamp literal:
```sql
SELECT TIMESTAMP '2019-01-14 20:54:00.000'
```
behaves similarly as casting the string literal:
```sql
SELECT CAST('2019-01-14 20:54:00.000' AS TIMESTAMP)
```
## How was this patch tested?
This was tested by `SQLQueryTestSuite` as well as `ExpressionParserSuite`.
Closes#23541 from MaxGekk/timestamp-date-constructors.
Lead-authored-by: Maxim Gekk <maxim.gekk@databricks.com>
Co-authored-by: Maxim Gekk <max.gekk@gmail.com>
Signed-off-by: Herman van Hovell <hvanhovell@databricks.com>
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