grpc produces leaks in NSM apps

[denis-tingaikin]

Description

It seems like the current version of grpc is leaking

Can be related to grpc/grpc-go#6761

Remaining work

• Create a new cmd nse app to simulate high load endpoint/networkservices registration ~ 4h
• Create a new cmd nsc app to simulate high load requests~ 4h
• Reproduce problems ~ 4h
• Verify that problem in the registry/heal ~4h
• Verify problems in the registry/dial ~4h
• Do fixes ~ 4h
• Test fixes ~ 4h
• Test regression (nse realocation) ~ 3h
• Open PRs ~ 2 h

[denis-tingaikin]

Related to networkservicemesh/cmd-nsmgr#675