`ksql-migrations` tool inserted null for map

[lihaosky]

Describe the bug When using ksql-migration tool to create table and insert values. null value was inserted for struct type.

To Reproduce Steps to reproduce the behavior, include: There are two files:

1. V000001__initialize_table_struct_insert_test.sql:

   CREATE TABLE struct_insert_test (
   `id` VARCHAR PRIMARY KEY,
   `testArr` ARRAY<VARCHAR>,
   `testObj` STRUCT<
       `testAttr` VARCHAR
   >
   ) WITH (
   KAFKA_TOPIC = 'struct-insert-test',
   VALUE_FORMAT = 'JSON',
   PARTITIONS = 1
   );

2. V000002__fill_table_struct_insert_test.sql:

   INSERT INTO STRUCT_INSERT_TEST (
   `id`,
   `testArr`,
   `testObj`
   ) VALUES (
   'TEST_ID',
   ARRAY[
       'TEST_ITEM_1',
       'TEST_ITEM_2'
   ],
   STRUCT(
       `testAttr` := 'TEST_VALUE'
   )
   );

Started ksql server locally and run

• bin/ksql-migrations new-project ~/ksql_migration/ http://localhost:8088
• bin/ksql-migrations --config-file ~/ksql_migration/ksql-migrations.properties initialize-metadata
• Copy files V000001__initialize_table_struct_insert_test.sql and V000002__fill_table_struct_insert_test.sql to migrations folder in ~/ksql_migration
• Run ./ksql-migrations -c /Users/hli/Desktop/migration_command/migrations/ksql-migrations.properties apply -n
• Run ./ksql-migrations -c /Users/hli/Desktop/migration_command/migrations/ksql-migrations.properties apply -n
• Run print 'struct-insert-test' from beginning; from ksql cli console
• Result: rowtime: 2022/11/28 19:18:14.069 Z, key: TEST_ID, value: {"testArr":["TEST_ITEM_1","TEST_ITEM_2"],"testObj":{"testAttr":null}}, partition: 0

Expected behavior key: TEST_ID, value: {"testArr":["TEST_ITEM_1","TEST_ITEM_2"],"testObj":{"testAttr":"TEST_VALUE"}}, partition: 0

Actual behaviour key: TEST_ID, value: {"testArr":["TEST_ITEM_1","TEST_ITEM_2"],"testObj":{"testAttr":null}}, partition: 0

Additional context Bug is here: https://github.com/confluentinc/ksql/blob/master/ksqldb-rest-app/src/main/java/io/confluent/ksql/api/util/ApiSqlValueCoercer.java#L95-L99. The struct on line 95 is a map with key TESTATTR but the coered on line 97 has field with name testaddr. Because of the case problem, https://github.com/confluentinc/ksql/blob/master/ksqldb-rest-app/src/main/java/io/confluent/ksql/api/util/ApiSqlValueCoercer.java#L111 is false and became null.

[suhas-satish]

cc: @lucasbru