Modify amf and ngap task to use protobuf map

[rsarwad]

Your Environment

• **Version:
• **Affected Component: Access Gateway
• **Affected Subcomponent: Within mme service, amf and ngap tasks
• **Deployment Environment:Vagrant (AGW)

Describe the Issue

As part of handling the issue, #10869 we have replaced the std::unordered_map to protobuf map. These changes are available in PR, #12427.

Here our goal is replace all amf task's hash tables and std::unordered_map to protobuf map, which is defined in proto_map.h file.

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