Fix #1669: JSR 303 annotations on array types

[sigpwned]

This is a (relatively) straightforward fix of the issue where JSR 303 annotations are not generated for array types. Closes #1669.

For example, the schema...

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "BinaryImageAttributes",
  "type": "object",
  "properties": {
    "bytes": {
      "type": "string",
      "media": {
        "binaryEncoding": "base64"
      },
      "description": "Base64-encoded binary image data.",
      "minLength": 1,
      "maxLength": 102400
    }
  },
  "required": ["bytes"]
}

...should generate a @Size annotation on the bytes field due to the presence of minLength and maxLength, but it does not.

The core issue was that the code (quite reasonably) assumed that JType#fullName() would always return values that could subsequently be loaded by Class#forName(), modulo any type parameters. However, for arrays (e.g., byte arrays), JType#fullName() would return byte[], whereas Class#forName() expects [B. Simply checking for array types using JType#isArray() before inspecting names fixes the issue.

Fix includes tests.

Hopefully this all makes sense! Please send all questions, comments, and thoughts my way, and I will address ASAP.

Thank you building and continuing to maintain jsonschema2pojo!