[FEATURE] implment transpose command as in the roadmap

[asifabashar]

The transpose command outputs the requested number of search rows as columns, effectively transposing each result row into a corresponding column of field values. (Part of roadmap [#4287])

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Syntax

transpose [int] [column_name=<string>] 

Required Arguments: None.
Optional Arguments:

column_name
Syntax: column_name=<string>

Description: The name of the first column to use when transposing rows. This column holds the field names.

Default: column

int
Syntax: <int>

Description: Limit the number of rows to transpose. 

Default: 5

Usage Notes: 

When you use the transpose command, the field names in the output depend on the arguments provided.
By default, the field names are:
column, row 1, row 2, ...

Examples
1. Transpose the results of a stats command

os> source=accounts | stats sum(age) by gender, state
| sum(age) | gender | state |
|-----------|---------|--------|
| 36        | M       | TN     |
| 33        | M       | MD     |
| 32        | M       | IL     |
| 28        | F       | VA     |


When you add the transpose command to the end of the search, the results look something like this:
os> source=accounts | stats sum(age) by gender, state | transpose
| column     | row 1 | row 2 | row 3 | row 4 |
|-------------|-------|-------|-------|-------|
| sum(age)    | 36    | 33    | 32    | 28    |
| gender      | M     | M     | M     | F     |
| state       | TN    | MD    | IL    | VA    |




**Is your feature request related to a problem?**
Implement SPL equivalent in PPL for transpose

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[asifabashar]

Please assign this to me if no one else is already working on it.