Test avro version compatability

[vinishjail97]

Important Read

• Please ensure the GitHub issue is mentioned at the beginning of the PR

What is the purpose of the pull request

(For example: This pull request implements the sync for delta format.)

Avro schema not being parsed with recursive update.

{
  "type" : "record",
  "name" : "HoodieCleanMetadata",
  "namespace" : "org.apache.hudi.avro.model",
  "fields" : [ {
    "name" : "startCleanTime",
    "type" : {
      "type" : "string",
      "avro.java.string" : "String"
    }
  }, {
    "name" : "timeTakenInMillis",
    "type" : "long"
  }, {
    "name" : "totalFilesDeleted",
    "type" : "int"
  }, {
    "name" : "earliestCommitToRetain",
    "type" : {
      "type" : "string",
      "avro.java.string" : "String"
    }
  }, {
    "name" : "lastCompletedCommitTimestamp",
    "type" : {
      "type" : "string",
      "avro.java.string" : "String"
    },
    "default" : ""
  }, {
    "name" : "partitionMetadata",
    "type" : {
      "type" : "map",
      "values" : {
        "type" : "record",
        "name" : "HoodieCleanPartitionMetadata",
        "fields" : [ {
          "name" : "partitionPath",
          "type" : {
            "type" : "string",
            "avro.java.string" : "String"
          }
        }, {
          "name" : "policy",
          "type" : {
            "type" : "string",
            "avro.java.string" : "String"
          }
        }, {
          "name" : "deletePathPatterns",
          "type" : {
            "type" : "array",
            "items" : {
              "type" : "string",
              "avro.java.string" : "String"
            }
          }
        }, {
          "name" : "successDeleteFiles",
          "type" : {
            "type" : "array",
            "items" : {
              "type" : "string",
              "avro.java.string" : "String"
            }
          }
        }, {
          "name" : "failedDeleteFiles",
          "type" : {
            "type" : "array",
            "items" : {
              "type" : "string",
              "avro.java.string" : "String"
            }
          }
        }, {
          "name" : "isPartitionDeleted",
          "type" : [ "null", "boolean" ],
          "default" : null
        } ]
      },
      "avro.java.string" : "String"
    }
  }, {
    "name" : "version",
    "type" : [ "int", "null" ],
    "default" : 1
  }, {
    "name" : "bootstrapPartitionMetadata",
    "type" : [ "null", {
      "type" : "map",
      "values" : "HoodieCleanPartitionMetadata",
      "avro.java.string" : "String",
      "default" : null
    } ],
    "default" : null
  } ]
}

(for example:)

• Fixed JSON parsing error when persisting state
• Added unit tests for schema evolution

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This pull request is a trivial rework / code cleanup without any test coverage.

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This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

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• Added integration tests for end-to-end.
• Added TestConversionController to verify the change.
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