[SPARK-16157][SQL] Add New Methods for comments in StructField and StructType

#### What changes were proposed in this pull request?
Based on the previous discussion with cloud-fan hvanhovell in another related PR https://github.com/apache/spark/pull/13764#discussion_r67994276, it looks reasonable to add convenience methods for users to add `comment` when defining `StructField`.

Currently, the column-related `comment` attribute is stored in `Metadata` of `StructField`. For example, users can add the `comment` attribute using the following way:
```Scala
StructType(
  StructField(
    "cl1",
    IntegerType,
    nullable = false,
    new MetadataBuilder().putString("comment", "test").build()) :: Nil)
```
This PR is to add more user friendly methods for the `comment` attribute when defining a `StructField`. After the changes, users are provided three different ways to do it:
```Scala
val struct = (new StructType)
  .add("a", "int", true, "test1")

val struct = (new StructType)
  .add("c", StringType, true, "test3")

val struct = (new StructType)
  .add(StructField("d", StringType).withComment("test4"))
```

#### How was this patch tested?
Added test cases:
- `DataTypeSuite` is for testing three types of API changes,
- `DataFrameReaderWriterSuite` is for parquet, json and csv formats - using in-memory catalog
- `OrcQuerySuite.scala` is for orc format using Hive-metastore

Author: gatorsmile <gatorsmile@gmail.com>

Closes #13860 from gatorsmile/newMethodForComment.