[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>
Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Alex Dovenmuehle <alex.dovenmuehle@mattermost.com>
Co-authored-by: Michael Kochell <6913320+mickmister@users.noreply.github.com>
Co-authored-by: Christopher Poile <cpoile@gmail.com>
Co-authored-by: İlker Göktuğ Öztürk <ilkergoktugozturk@gmail.com>
Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
Co-authored-by: Daniel Espino García <larkox@gmail.com>
Co-authored-by: Christopher Speller <crspeller@gmail.com>
Co-authored-by: Alex Dovenmuehle <adovenmuehle@gmail.com>
Co-authored-by: Szymon Gibała <szymongib@gmail.com>
Co-authored-by: Lev <1187448+levb@users.noreply.github.com>
Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>
Co-authored-by: Artur M. Wolff <artur.m.wolff@gmail.com>
Co-authored-by: Madhav Hugar <16546715+madhavhugar@users.noreply.github.com>
Co-authored-by: Joe <security.joe@pm.me>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Co-authored-by: José Peso <trilopin@users.noreply.github.com>

server/public/pluginapi/experimental/bot/logger/logger.go

@@ -0,0 +1,78 @@
+package logger
+
+import "time"
+
+const (
+	timed   = "__since"
+	elapsed = "Elapsed"
+
+	ErrorKey = "error"
+)
+
+// LogLevel defines the level of log messages
+type LogLevel string
+
+const (
+	// LogLevelDebug denotes debug messages
+	LogLevelDebug = "debug"
+	// LogLevelInfo denotes info messages
+	LogLevelInfo = "info"
+	// LogLevelWarn denotes warn messages
+	LogLevelWarn = "warn"
+	// LogLevelError denotes error messages
+	LogLevelError = "error"
+)
+
+// LogContext defines the context for the logs.
+type LogContext map[string]interface{}
+
+// Logger defines an object able to log messages.
+type Logger interface {
+	// With adds a logContext to the logger.
+	With(LogContext) Logger
+	// WithError adds an Error to the logger.
+	WithError(error) Logger
+	// Context returns the current context
+	Context() LogContext
+	// Timed add a timed log context.
+	Timed() Logger
+	// Debugf logs a formatted string as a debug message.
+	Debugf(format string, args ...interface{})
+	// Errorf logs a formatted string as an error message.
+	Errorf(format string, args ...interface{})
+	// Infof logs a formatted string as an info message.
+	Infof(format string, args ...interface{})
+	// Warnf logs a formatted string as an warning message.
+	Warnf(format string, args ...interface{})
+}
+
+func measure(lc LogContext) {
+	if lc[timed] == nil {
+		return
+	}
+	started := lc[timed].(time.Time)
+	lc[elapsed] = time.Since(started).String()
+	delete(lc, timed)
+}
+
+// Level assigns an integer to the LogLevel string
+func Level(l LogLevel) int {
+	switch l {
+	case LogLevelDebug:
+		return 4
+	case LogLevelInfo:
+		return 3
+	case LogLevelWarn:
+		return 2
+	case LogLevelError:
+		return 1
+	}
+	return 0
+}
+
+func toKeyValuePairs(in map[string]interface{}) (out []interface{}) {
+	for k, v := range in {
+		out = append(out, k, v)
+	}
+	return out
+}