[SPARK-3790][MLlib] CosineSimilarity Example

Provide example  for `RowMatrix.columnSimilarity()`

Author: Reza Zadeh <rizlar@gmail.com>

Closes #2622 from rezazadeh/dimsumexample and squashes the following commits:

8f20b82 [Reza Zadeh] update comment
379066d [Reza Zadeh] cache rows
792b81c [Reza Zadeh] Address review comments
e573c7a [Reza Zadeh] Average absolute error
b15685f [Reza Zadeh] Use scopt. Distribute evaluation.
eca3dfd [Reza Zadeh] Documentation
ac96fb2 [Reza Zadeh] Compute approximation error, add command line.
4533579 [Reza Zadeh] CosineSimilarity Example