[confignet] added NewDefaultFunctions (#9671)

**Description:**
Added newDefault methods for structs in confignet package

**Link to tracking Issue:** 
closes #9656 

**Testing:** Tests were added for the newDefault functions

**Documentation:** <Describe the documentation added.>
godoc

---------

Co-authored-by: Tyler Helmuth <12352919+TylerHelmuth@users.noreply.github.com>

.chloggen/confignet-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: confignet
+
+# 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: [9656]
+
+# (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/confignet/confignet.go

@@ -62,6 +62,11 @@ type DialerConfig struct {
 	Timeout time.Duration `mapstructure:"timeout"`
 }
 
+// NewDefaultDialerConfig creates a new DialerConfig with any default values set
+func NewDefaultDialerConfig() DialerConfig {
+	return DialerConfig{}
+}
+
 // AddrConfig represents a network endpoint address.
 type AddrConfig struct {
 	// Endpoint configures the address for this network connection.
@@ -79,6 +84,13 @@ type AddrConfig struct {
 	DialerConfig DialerConfig `mapstructure:"dialer"`
 }
 
+// NewDefaultAddrConfig creates a new AddrConfig with any default values set
+func NewDefaultAddrConfig() AddrConfig {
+	return AddrConfig{
+		DialerConfig: NewDefaultDialerConfig(),
+	}
+}
+
 // Dial equivalent with net.Dialer's DialContext for this address.
 func (na *AddrConfig) Dial(ctx context.Context) (net.Conn, error) {
 	d := net.Dialer{Timeout: na.DialerConfig.Timeout}
@@ -124,6 +136,13 @@ type TCPAddrConfig struct {
 	DialerConfig DialerConfig `mapstructure:"dialer"`
 }
 
+// NewDefaultTCPAddrConfig creates a new TCPAddrConfig with any default values set
+func NewDefaultTCPAddrConfig() TCPAddrConfig {
+	return TCPAddrConfig{
+		DialerConfig: NewDefaultDialerConfig(),
+	}
+}
+
 // Dial equivalent with net.Dialer's DialContext for this address.
 func (na *TCPAddrConfig) Dial(ctx context.Context) (net.Conn, error) {
 	d := net.Dialer{Timeout: na.DialerConfig.Timeout}

config/confignet/confignet_test.go

@@ -14,6 +14,24 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestNewDefaultDialerConfig(t *testing.T) {
+	expectedDialerConfig := DialerConfig{}
+	dialerConfig := NewDefaultDialerConfig()
+	require.Equal(t, expectedDialerConfig, dialerConfig)
+}
+
+func TestNewDefaultAddrConfig(t *testing.T) {
+	expectedAddrConfig := AddrConfig{}
+	addrConfig := NewDefaultAddrConfig()
+	require.Equal(t, expectedAddrConfig, addrConfig)
+}
+
+func TestNewDefaultTCPAddrConfig(t *testing.T) {
+	expectedTCPAddrConfig := TCPAddrConfig{}
+	tcpAddrconfig := NewDefaultTCPAddrConfig()
+	require.Equal(t, expectedTCPAddrConfig, tcpAddrconfig)
+}
+
 func TestAddrConfigTimeout(t *testing.T) {
 	nac := &AddrConfig{
 		Endpoint:  "localhost:0",