[SPARK-16222][SQL] JDBC Sources - Handling illegal input values for `fetchsize` and `batchsize`

#### What changes were proposed in this pull request?
For JDBC data sources, users can specify `batchsize` for multi-row inserts and `fetchsize` for multi-row fetch. A few issues exist:

- The property keys are case sensitive. Thus, the existing test cases for `fetchsize` use incorrect names, `fetchSize`. Basically, the test cases are broken.
- No test case exists for `batchsize`.
- We do not detect the illegal input values for `fetchsize` and `batchsize`.

For example, when `batchsize` is zero, we got the following exception:
```
Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost): java.lang.ArithmeticException: / by zero
```
when `fetchsize` is less than zero, we got the exception from the underlying JDBC driver:
```
Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost): org.h2.jdbc.JdbcSQLException: Invalid value "-1" for parameter "rows" [90008-183]
```

This PR fixes all the above issues, and issue the appropriate exceptions when detecting the illegal inputs for `fetchsize` and `batchsize`. Also update the function descriptions.

#### How was this patch tested?
Test cases are fixed and added.

Author: gatorsmile <gatorsmile@gmail.com>

Closes #13919 from gatorsmile/jdbcProperties.

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