MM-12389 Update segment library to v3 (#11472)

* Update analytics-go dependency

* Migrate from segment library v2 to v3

* Reinclude gorilla/handlers module

* Fix missing module

* Remove reference to outdated analytics module

vendor/github.com/segmentio/analytics-go/.gitmodules

@@ -0,0 +1,6 @@
+[submodule "vendor/github.com/segmentio/backo-go"]
+	path = vendor/github.com/segmentio/backo-go
+	url = https://github.com/segmentio/backo-go
+[submodule "vendor/github.com/xtgo/uuid"]
+	path = vendor/github.com/xtgo/uuid
+	url = https://github.com/xtgo/uuid