[SPARK-30648][SQL][FOLLOWUP] Refactoring of JsonFilters: move config checking out

[MaxGekk]

What changes were proposed in this pull request?

Refactoring of JsonFilters:

• Add an assert to the skipRow method to check the input index
• Move checking of the SQL config spark.sql.json.filterPushdown.enabled from JsonFilters to JacksonParser.

Why are the changes needed?

1. The assert should catch incorrect usage of JsonFilters
2. The config checking out of JsonFilters makes it consistent with OrderedFilters (see [SPARK-32346][SQL] Support filters pushdown in Avro datasource #29145).
3. JsonFilters can be used by other datasource in the future and don't depend from the JSON configs.

Does this PR introduce any user-facing change?

No

How was this patch tested?

By existing tests suites:

$ build/sbt "sql/test:testOnly org.apache.spark.sql.execution.datasources.json.*"
$ build/sbt "test:testOnly org.apache.spark.sql.catalyst.json.*"

[SparkQA]

Test build #126418 has finished for PR 29206 at commit 8e3b94d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

Merged to master.