Add Support for Additional DataFrame Functionality

The DataFrame still has lots of missing functions that need to be implemented. This is the umbrella item for that.

Most of them should be relatively mechanical, but some require some additional work.

|Method|Support|
|---|---|
|`agg`|:white_check_mark:|
|`alias`|:white_check_mark:|
|`approxQuantile`|:white_check_mark:|
|`cache`|:white_check_mark:|
|`checkpoint`|:x:|
|`coalesce`|:white_check_mark:|
|`colRegex`|:white_check_mark: (`OfDFWithRegex`)|
|`collect`|:white_check_mark: |
|`columns`|:white_check_mark:|
|`corr`|:white_check_mark:|
|`count`|:white_check_mark:|
|`cov`|:white_check_mark:|
|`createGlobalTempView`|:white_check_mark:|
|`createOrReplaceGlobalTempView`|:white_check_mark:|
|`createOrReplaceTempView`|:white_check_mark:|
|`createTempView`|:white_check_mark: |
|`crossJoin`|:white_check_mark:|
|`crosstab`|:white_check_mark:|
|`cube`|:white_check_mark:|
|`describe`|:white_check_mark:|
|`distinct`|:white_check_mark:|
|`drop`|:white_check_mark:|
|`dropDuplicates`|:white_check_mark:|
|`dropDuplicatesWithinWatermark`|:x:|
|`dropna`|:white_check_mark:|
|`dtypes`|:x:|
|`exceptAll`|:white_check_mark:|
|`executionInfo`|:x:|
|`explain`|:white_check_mark:|
|`fillna`|:white_check_mark:|
|`filter`|:white_check_mark: |
|`first`|:white_check_mark:|
|`foreach`|:heavy_minus_sign: (needs native UDFs)|
|`foreachPartition`|:heavy_minus_sign: (needs native UDFs)|
|`freqItems`|:white_check_mark:|
|`groupBy`|:white_check_mark: (some restrictions apply)|
|`head`|:white_check_mark:|
|`hint`|:x:|
|`inputFiles`|:x:|
|`intersect`|:white_check_mark:|
|`intersectAll`|:white_check_mark:|
|`isEmpty`|:white_check_mark:|
|`isLocal`|:x:|
|`isStreaming`|:x:|
|`is_cached`|:x:|
|`join`|:white_check_mark:|
|`limit`|:white_check_mark:|
|`localCheckpoint`|:x:|
|`mapInArrow`|:heavy_minus_sign: (needs native UDFs)|
|`mapInPandas`|:heavy_minus_sign: (needs native UDFs)|
|`melt`|:white_check_mark:|
|`mergeInto`|:x:|
|`na`|:white_check_mark:|
|`observe`|:x:|
|`offset`|:white_check_mark:|
|`orderBy`|:white_check_mark:|
|`pandas_api`|:heavy_minus_sign:|
|`persist`|:white_check_mark:|
|`printSchema`|:x:|
|`randomSplit`|:white_check_mark:|
|`rdd`|:heavy_minus_sign:|
|`registerTempTable`|:x:|
|`repartition`|:white_check_mark: |
|`repartitionByRange`|:white_check_mark: |
|`replace`|:white_check_mark:|
|`rollup`|:white_check_mark:|
|`sameSemantics`|:white_check_mark:|
|`sample`|:white_check_mark:|
|`sampleBy`|:x:|
|`schema`|:white_check_mark:|
|`select`|:white_check_mark:|
|`selectExpr`|:white_check_mark:|
|`semanticHash`|:white_check_mark:|
|`show`|:white_check_mark: |
|`sort`|:white_check_mark:|
|`sortWithinPartitions`|:white_check_mark:|
|`sparkSession`|:x:|
|`stat`|:white_check_mark:|
|`storageLevel`|:white_check_mark:|
|`subtract`|:white_check_mark:|
|`summary`|:white_check_mark:|
|`tail`|:white_check_mark:|
|`take`|:white_check_mark:|
|`to`|:x:|
|`toArrow`|:white_check_mark:|
|`toDF`|:x:|
|`toJSON`|:x:|
|`toLocalIterator`|:x:|
|`toPandas`|:heavy_minus_sign:|
|`transform`|:x:|
|`union`|:white_check_mark:|
|`unionAll`|:white_check_mark:|
|`unionByName`|:white_check_mark:|
|`unpersist`|:white_check_mark:|
|`unpivot`|:white_check_mark:|
|`where`|:white_check_mark:|
|`withColumn`|:white_check_mark:|
|`withColumnRenamed`|:white_check_mark:|
|`withColumns`|:white_check_mark:|
|`withColumnsRenamed`|:white_check_mark:|
|`withMetadata`|:white_check_mark:|
|`withWatermark`|:white_check_mark:|
|`write`|:white_check_mark: |
|`writeStream`|:x:|
|`writeTo`|:x:|