GRPC v1 API

[josedonizetti]

There Tracee API server involves several changes which we are tracking at #2991 across releases.

This issue is tracking the work to be done to have a v1 GRPC API for 0.17.0. The v1 implementation should support the endpoints discussed:

service TraceeService {
    rpc GetEventDefinition(GetEventDefinitionRequest) returns (GetEventDefinitionResponse);
    rpc StreamEvents(StreamEventsRequest) returns (stream StreamEventsResponse);

    // global actions, enable/disable event
    rpc EnableEvent(EnableEventRequest) returns (EnableEventResponse);
    rpc DisableEvent(DisableEventRequest) returns (DisableEventResponse);

    rpc GetVersion(GetVersionRequest) returns (GetVersionResponse);
}

service diagnostic {
    GetMetrics()
    ChangeLogLevel() 
    DumpStack()
}

• GRPC Server
• Stream abstraction to be able to hook new output streams into the pipeline
• Migrate api to root dir (eg: "./api")
• StreamEvents endpoint
• Add Enable/Disable rule to Tracee
• Add Enable/Disable rule endpoint
• Add GetEventDefinition endponit
• Add Enable/Disable event
• Add Enable/Disable event endpoint
• Version endpoint
• Add Diagnostic service for ChangeLogLevel
• Add Diagnostic service for DumpStack
• Add Diagnostic service for GetMetrics