[MM-53968] Includes mattermost-plugin-api into the mono repo (#24235)

Include https://github.com/mattermost/mattermost-plugin-api into the mono repo

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Michael Kochell <mjkochell@gmail.com>
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Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
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server/public/pluginapi/experimental/common/logapi.go

@@ -0,0 +1,8 @@
+package common
+
+type LogAPI interface {
+	LogError(message string, keyValuePairs ...interface{})
+	LogWarn(message string, keyValuePairs ...interface{})
+	LogInfo(message string, keyValuePairs ...interface{})
+	LogDebug(message string, keyValuePairs ...interface{})
+}