[SPARK-51659] Add cache and describe-related sql test and answer files

### What changes were proposed in this pull request?

This PR aims to add cache and describe related SQL test and answer files.
- `cache.sql`
- `clear_cache.sql`
- `uncache.sql`
- `describe_function.sql`
- `describe_query.sql`

### Why are the changes needed?

To have a test coverage.

### Does this PR introduce _any_ user-facing change?

No, this is a test only change.

### How was this patch tested?

Pass the CIs.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #34 from dongjoon-hyun/SPARK-51659.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

Tests/SparkConnectTests/Resources/queries/cache.sql

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+CACHE TABLE testCache OPTIONS ('storageLevel' 'DISK_ONLY') SELECT 1 col;

Tests/SparkConnectTests/Resources/queries/cache.sql.json

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+[]

Tests/SparkConnectTests/Resources/queries/clear_cache.sql

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+CLEAR CACHE

Tests/SparkConnectTests/Resources/queries/clear_cache.sql.json

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+[]

Tests/SparkConnectTests/Resources/queries/describe_function.sql

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+DESCRIBE FUNCTION abs

Tests/SparkConnectTests/Resources/queries/describe_function.sql.json

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+[["Function: abs"],["Class: org.apache.spark.sql.catalyst.expressions.Abs"],["Usage: abs(expr) - Returns the absolute value of the numeric or interval value."]]

Tests/SparkConnectTests/Resources/queries/describe_query.sql

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+DESCRIBE QUERY VALUES(100, 'John', 10000.20D) AS employee(id, name, salary);

Tests/SparkConnectTests/Resources/queries/describe_query.sql.json

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+[["id","int",null],["name","string",null],["salary","double",null]]

Tests/SparkConnectTests/Resources/queries/uncache.sql

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+UNCACHE TABLE IF EXISTS t1

Tests/SparkConnectTests/Resources/queries/uncache.sql.json

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+[]