[SPARK-33363] Add prompt information related to the current task when pyspark/sparkR starts

### What changes were proposed in this pull request?
add prompt information about current applicationId, current URL and master info when pyspark / sparkR starts.

### Why are the changes needed?
The information printed when pyspark/sparkR starts does not prompt the basic information of current application, and it is not convenient when used pyspark/sparkR in dos.

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
manual test result shows below:
![pyspark new print](https://user-images.githubusercontent.com/52202080/98274268-2a663f00-1fce-11eb-88ce-964ce90b439e.png)
![sparkR](https://user-images.githubusercontent.com/52202080/98541235-1a01dd00-22ca-11eb-9304-09bcde87b05e.png)

Closes #30266 from akiyamaneko/pyspark-hint-info.

Authored-by: neko <echohlne@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

R/pkg/inst/profile/shell.R

@@ -43,5 +43,7 @@
   cat("      /_/", "\n")
   cat("\n")
 
-  cat("\nSparkSession available as 'spark'.\n")
+  cat("\nSparkSession Web UI available at", SparkR::sparkR.uiWebUrl())
+  cat("\nSparkSession available as 'spark'(master = ", unlist(SparkR::sparkR.conf("spark.master")),
+    ", app id = ", unlist(SparkR::sparkR.conf("spark.app.id")), ").", "\n", sep = "")
 }

python/pyspark/shell.py

@@ -62,6 +62,8 @@ print("Using Python version %s (%s, %s)" % (
     platform.python_version(),
     platform.python_build()[0],
     platform.python_build()[1]))
+print("Spark context Web UI available at %s" % (sc.uiWebUrl))
+print("Spark context available as 'sc' (master = %s, app id = %s)." % (sc.master, sc.applicationId))
 print("SparkSession available as 'spark'.")
 
 # The ./bin/pyspark script stores the old PYTHONSTARTUP value in OLD_PYTHONSTARTUP,