[SPARK-34619][SQL][DOCS] Describe ANSI interval types at the `Data types` page of the SQL reference
[SPARK-34619][SQL][DOCS] Describe ANSI interval types at the `Data types` page of the SQL reference

### What changes were proposed in this pull request?
In the PR, I propose to update the page https://spark.apache.org/docs/latest/sql-ref-datatypes.html and add information about the year-month and day-time interval types introduced by SPARK-27790.

<img width="932" alt="Screenshot 2021-07-27 at 10 38 23" src="https://user-images.githubusercontent.com/1580697/127115289-e633ca3a-2c18-49a0-a7c0-22421ae5c363.png">

### Why are the changes needed?
To inform users about new ANSI interval types, and improve UX with Spark SQL.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Should be tested by a GitHub action.

Closes #33518 from MaxGekk/doc-interval-types.

Authored-by: Max Gekk <b91a34c712a29cd91cde3972985e114f1bb54d88@gmail.com>
Signed-off-by: Kousuke Saruta <7d45abe39fd242ee2f6575da28f13d66568418b3@oss.nttdata.com>

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