Improve memory usage

[utr1903]

Summary

The filterprocessor for each team increases the memory consumption. When the amount of namespaces are too much, the memory usage skyrockets and keeps making the collector pods OOMKilled.

Desired Behavior

Flexibility to fine-tune memory consumption.

Possible Solution

1. Migrate from filterprocessor to routingconnector
2. Tune GOMEMLIMIT(Migrate deprecated memory_ballast extension to GOMEMLIMIT variable. #144)

Additional context