[Rumen] Rumen should provide simple trace filtering capabilities

Rumen should provide inbuilt tools to filter jobs from a given trace. Following are the usecases:
1. Select only first k jobs.
2. Select jobs with certain configuration keys set or available
3. Select jobs where the original job id matches the specified list
4. Select jobs which have at-least/at-most x map tasks and/or at-least/at-most y reduce tasks.
5. Select jobs belonging to a specific user(s)
6. Select jobs having specific name(s)
and so on.