[MM-64686] Expose audit logging functionality via plugin API (#31204)

This commit exposes audit logging functionality to plugins via the plugin API, allowing plugins to create and log audit records. Additionally, it addresses a gob encoding issue that could cause plugin crashes when audit data contains nil pointers or unregistered types.

server/channels/api4/license_local.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/public/shared/mlog"
-	"github.com/mattermost/mattermost/server/v8/channels/audit"
 )
 
 func (api *API) InitLicenseLocal() {
@@ -20,7 +19,7 @@ func (api *API) InitLicenseLocal() {
 }
 
 func localAddLicense(c *Context, w http.ResponseWriter, r *http.Request) {
-	auditRec := c.MakeAuditRecord("localAddLicense", audit.Fail)
+	auditRec := c.MakeAuditRecord("localAddLicense", model.AuditStatusFail)
 	defer c.LogAuditRec(auditRec)
 	c.LogAudit("attempt")
 
@@ -44,7 +43,7 @@ func localAddLicense(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	fileData := fileArray[0]
-	audit.AddEventParameter(auditRec, "filename", fileData.Filename)
+	model.AddEventParameterToAuditRec(auditRec, "filename", fileData.Filename)
 
 	file, err := fileData.Open()
 	if err != nil {
@@ -81,7 +80,7 @@ func localAddLicense(c *Context, w http.ResponseWriter, r *http.Request) {
 }
 
 func localRemoveLicense(c *Context, w http.ResponseWriter, r *http.Request) {
-	auditRec := c.MakeAuditRecord("localRemoveLicense", audit.Fail)
+	auditRec := c.MakeAuditRecord("localRemoveLicense", model.AuditStatusFail)
 	defer c.LogAuditRec(auditRec)
 	c.LogAudit("attempt")