v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/plugin/hclog_adapter.go

@@ -0,0 +1,135 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"strings"
+
+	"github.com/hashicorp/go-hclog"
+
+	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
+)
+
+type hclogAdapter struct {
+	wrappedLogger *mlog.Logger
+	extrasKey     string
+}
+
+func (h *hclogAdapter) Log(level hclog.Level, msg string, args ...any) {
+	switch level {
+	case hclog.Trace:
+		h.Trace(msg, args...)
+	case hclog.Debug:
+		h.Debug(msg, args...)
+	case hclog.Info:
+		h.Info(msg, args...)
+	case hclog.Warn:
+		h.Warn(msg, args...)
+	case hclog.Error:
+		h.Error(msg, args...)
+	default:
+		// For unknown/unexpected log level, treat it as an error so we notice and fix the code.
+		h.Error(msg, args...)
+	}
+}
+
+func (h *hclogAdapter) Trace(msg string, args ...any) {
+	extras := strings.TrimSpace(fmt.Sprint(args...))
+	if extras != "" {
+		h.wrappedLogger.Debug(msg, mlog.String(h.extrasKey, extras))
+	} else {
+		h.wrappedLogger.Debug(msg)
+	}
+}
+
+func (h *hclogAdapter) Debug(msg string, args ...any) {
+	extras := strings.TrimSpace(fmt.Sprint(args...))
+	if extras != "" {
+		h.wrappedLogger.Debug(msg, mlog.String(h.extrasKey, extras))
+	} else {
+		h.wrappedLogger.Debug(msg)
+	}
+}
+
+func (h *hclogAdapter) Info(msg string, args ...any) {
+	extras := strings.TrimSpace(fmt.Sprint(args...))
+	if extras != "" {
+		h.wrappedLogger.Info(msg, mlog.String(h.extrasKey, extras))
+	} else {
+		h.wrappedLogger.Info(msg)
+	}
+}
+
+func (h *hclogAdapter) Warn(msg string, args ...any) {
+	extras := strings.TrimSpace(fmt.Sprint(args...))
+	if extras != "" {
+		h.wrappedLogger.Warn(msg, mlog.String(h.extrasKey, extras))
+	} else {
+		h.wrappedLogger.Warn(msg)
+	}
+}
+
+func (h *hclogAdapter) Error(msg string, args ...any) {
+	extras := strings.TrimSpace(fmt.Sprint(args...))
+	if extras != "" {
+		h.wrappedLogger.Error(msg, mlog.String(h.extrasKey, extras))
+	} else {
+		h.wrappedLogger.Error(msg)
+	}
+}
+
+func (h *hclogAdapter) IsTrace() bool {
+	return false
+}
+
+func (h *hclogAdapter) IsDebug() bool {
+	return true
+}
+
+func (h *hclogAdapter) IsInfo() bool {
+	return true
+}
+
+func (h *hclogAdapter) IsWarn() bool {
+	return true
+}
+
+func (h *hclogAdapter) IsError() bool {
+	return true
+}
+
+func (h *hclogAdapter) With(args ...any) hclog.Logger {
+	return h
+}
+
+func (h *hclogAdapter) Named(name string) hclog.Logger {
+	return h
+}
+
+func (h *hclogAdapter) ResetNamed(name string) hclog.Logger {
+	return h
+}
+
+func (h *hclogAdapter) StandardLogger(opts *hclog.StandardLoggerOptions) *log.Logger {
+	return h.wrappedLogger.StdLogger(mlog.LvlInfo)
+}
+
+func (h *hclogAdapter) StandardWriter(opts *hclog.StandardLoggerOptions) io.Writer {
+	return h.wrappedLogger.StdLogWriter()
+}
+
+func (h *hclogAdapter) SetLevel(hclog.Level) {}
+
+func (h *hclogAdapter) GetLevel() hclog.Level { return hclog.NoLevel }
+
+func (h *hclogAdapter) ImpliedArgs() []any {
+	return []any{}
+}
+
+func (h *hclogAdapter) Name() string {
+	return "MattermostPluginLogger"
+}