api: Add consts for predefined networks
Related to:

- https://github.com/docker/cli/pull/4493#discussion_r1298609663
- https://github.com/moby/moby/issues/19421

**- What I did**

Constants for both platform-specific and platform-independent networks are added to the api/network package.

**- A picture of a cute animal (not mandatory but encouraged)**

![](https://cdn.cdnparenting.com/articles/2019/06/01154838/Parrot-Facts-for-Kids-1115777186.webp)
api/types/container/hostconfig_windows.go
package container // import "github.com/docker/docker/api/types/container"

// IsBridge indicates whether container uses the bridge network stack
// in windows it is given the name NAT
func (n NetworkMode) IsBridge() bool {
	return n == "nat"
}

// IsHost indicates whether container uses the host network stack.
// returns false as this is not supported by windows
func (n NetworkMode) IsHost() bool {
	return false
}

// IsUserDefined indicates user-created network
func (n NetworkMode) IsUserDefined() bool {
	return !n.IsDefault() && !n.IsNone() && !n.IsBridge() && !n.IsContainer()
}

// IsValid indicates if an isolation technology is valid
func (i Isolation) IsValid() bool {
	return i.IsDefault() || i.IsHyperV() || i.IsProcess()
}

// NetworkName returns the name of the network stack.
func (n NetworkMode) NetworkName() string {
	if n.IsDefault() {
		return "default"
	} else if n.IsBridge() {
		return "nat"
	} else if n.IsNone() {
		return "none"
	} else if n.IsContainer() {
		return "container"
	} else if n.IsUserDefined() {
		return n.UserDefined()
	}

	return ""
}

package container // import "github.com/docker/docker/api/types/container"

import "github.com/docker/docker/api/types/network"

// IsBridge indicates whether container uses the bridge network stack
// in windows it is given the name NAT
func (n NetworkMode) IsBridge() bool {
	return n == network.NetworkNat
}

// IsHost indicates whether container uses the host network stack.
// returns false as this is not supported by windows
func (n NetworkMode) IsHost() bool {
	return false
}

// IsUserDefined indicates user-created network
func (n NetworkMode) IsUserDefined() bool {
	return !n.IsDefault() && !n.IsNone() && !n.IsBridge() && !n.IsContainer()
}

// IsValid indicates if an isolation technology is valid
func (i Isolation) IsValid() bool {
	return i.IsDefault() || i.IsHyperV() || i.IsProcess()
}

// NetworkName returns the name of the network stack.
func (n NetworkMode) NetworkName() string {
	if n.IsDefault() {
		return network.NetworkDefault
	} else if n.IsBridge() {
		return network.NetworkNat
	} else if n.IsNone() {
		return network.NetworkNone
	} else if n.IsContainer() {
		return "container"
	} else if n.IsUserDefined() {
		return n.UserDefined()
	}

	return ""
}

Would it make sense to define the types in this package? (Given that `NetworkMode` is also defined here 🤔)