[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/test_logger.go

@@ -0,0 +1,61 @@
+package logger
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+type testLogger struct {
+	testing.TB
+	logContext LogContext
+}
+
+// NewTestLogger creates a logger for testing purposes.
+func NewTestLogger() Logger {
+	return &testLogger{}
+}
+
+func (l *testLogger) With(logContext LogContext) Logger {
+	newl := *l
+	if len(newl.logContext) == 0 {
+		newl.logContext = map[string]interface{}{}
+	}
+	for k, v := range logContext {
+		newl.logContext[k] = v
+	}
+	return &newl
+}
+
+func (l *testLogger) WithError(err error) Logger {
+	newl := *l
+	if len(newl.logContext) == 0 {
+		newl.logContext = map[string]interface{}{}
+	}
+	newl.logContext[ErrorKey] = err.Error()
+	return &newl
+}
+
+func (l *testLogger) Context() LogContext {
+	return l.logContext
+}
+
+func (l *testLogger) Timed() Logger {
+	return l.With(LogContext{
+		timed: time.Now(),
+	})
+}
+
+func (l *testLogger) logf(prefix, format string, args ...interface{}) {
+	out := fmt.Sprintf(prefix+": "+format, args...)
+	if len(l.logContext) > 0 {
+		measure(l.logContext)
+		out += fmt.Sprintf(" -- %+v", l.logContext)
+	}
+	l.TB.Logf(out)
+}
+
+func (l *testLogger) Debugf(format string, args ...interface{}) { l.logf("DEBUG", format, args...) }
+func (l *testLogger) Errorf(format string, args ...interface{}) { l.logf("ERROR", format, args...) }
+func (l *testLogger) Infof(format string, args ...interface{})  { l.logf("INFO", format, args...) }
+func (l *testLogger) Warnf(format string, args ...interface{})  { l.logf("WARN", format, args...) }