Added default functions for configauth (#9850)

Description:
Added NewDefault methods for structs in `configauth` package

Link to tracking Issue:
Closes #9821

Testing: Tests were added for the NewDefault functions

---------

Co-authored-by: Tyler Helmuth <[email protected]>
Co-authored-by: Alex Boten <[email protected]>

Author: 3 people

.chloggen/configauth-add-NewDefault-func.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: configauth
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Adds `NewDefault*` functions for all the config structs.
+
+# One or more tracking issues or pull requests related to the change
+issues: [9821]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

config/configauth/configauth.go

@@ -26,6 +26,11 @@ type Authentication struct {
 	AuthenticatorID component.ID `mapstructure:"authenticator"`
 }
 
+// NewDefaultAuthentication returns a default authentication configuration.
+func NewDefaultAuthentication() *Authentication {
+	return &Authentication{}
+}
+
 // GetServerAuthenticator attempts to select the appropriate auth.Server from the list of extensions,
 // based on the requested extension name. If an authenticator is not found, an error is returned.
 func (a Authentication) GetServerAuthenticator(extensions map[component.ID]component.Component) (auth.Server, error) {

config/configauth/configauth_test.go

@@ -15,6 +15,12 @@ import (
 
 var mockID = component.MustNewID("mock")
 
+func TestNewDefaultAuthentication(t *testing.T) {
+	auth := NewDefaultAuthentication()
+	assert.NotNil(t, auth)
+	assert.Empty(t, auth)
+}
+
 func TestGetServer(t *testing.T) {
 	testCases := []struct {
 		desc          string