Resource (CPU, RAM) limits on TES tasks

[zagganas]

Right now the TES schema only supports resource requests but not resource limits. Resource limits are particularly useful in settings where the users want to limit the amount of resources consumed by a given task.

Additionally, it is supported by K8s and it even helps the scheduling algorithm assign the pods to particular worker machines based on the available resources.

[uniqueg]

This was also requested by the Czech ELIXIR node, see here: https://docs.google.com/spreadsheets/d/1vBFhBQ-nFqhSL5dLjQfOWO6x9BzmV9x6l18p9GYRZdQ/edit#gid=0

Contacts: @xhejtman & @viktoriaas

[uniqueg]

Also, this has ties with #84, #127/#154 and #163