feat: Add new logger module - Pubstack Analytics Module (prebid#1331)

* Pubstack Analytics V1 (#11)

* V1 Pubstack (#7)

* feat: Add Pubstack Logger (#6)

* first version of pubstack analytics

* bypass viperconfig

* commit #1

* gofmt

* update configuration and make the tests pass

* add readme on how to configure the adapter and update the network calls

* update logging and fix intake url definition

* feat: Pubstack Analytics Connector

* fixing go mod

* fix: bad behaviour on appending path to auction url

* add buffering

* support bootstyrap like configuration

* implement route for all the objects

* supports termination signal handling for goroutines

* move readme to the correct location

* wording

* enable configuration reload + add tests

* fix logs messages

* fix tests

* fix log line

* conclude merge

* merge

* update go mod

Co-authored-by: Amaury Ravanel <amaury.ravanel@gmail.com>

* fix duplicated channel keys

Co-authored-by: Amaury Ravanel <amaury.ravanel@gmail.com>

* first pass - PR reviews

* rename channel* -> eventChannel

* dead code

* Review (#10)

* use json.Decoder

* update documentation

* use nil instead []byte("")

* clean code

* do not use http.DefaultClient

* fix race condition (need validation)

* separate the sender and buffer logics

* refactor the default configuration

* remove error counter

* Review GP + AR

* updating default config

* add more logs

* remove alias fields in json

* fix json serializer

* close event channels

Co-authored-by: Amaury Ravanel <amaury.ravanel@gmail.com>

* fix race condition

* first pass (pr reviews)

* refactor: store enabled modules into a dedicated struct

* stop goroutine

* test: improve coverage

* PR Review

* Revert "refactor: store enabled modules into a dedicated struct"

This reverts commit f57d9d6.

# Conflicts:
#	analytics/config/config_test.go

Co-authored-by: Amaury Ravanel <amaury.ravanel@gmail.com>

analytics/config/config_test.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"github.com/stretchr/testify/assert"
 	"net/http"
 	"os"
 	"testing"