p2p/dnsdisc: add implementation of EIP-1459 (#20094)

This adds an implementation of node discovery via DNS TXT records to the
go-ethereum library. The implementation doesn't match EIP-1459 exactly,
the main difference being that this implementation uses separate merkle
trees for tree links and ENRs. The EIP will be updated to match p2p/dnsdisc.

To maintain DNS trees, cmd/devp2p provides a frontend for the p2p/dnsdisc
library. The new 'dns' subcommands can be used to create, sign and deploy DNS
discovery trees.

vendor/github.com/cloudflare/cloudflare-go/keyless.go

@@ -0,0 +1,52 @@
+package cloudflare
+
+import "time"
+
+// KeylessSSL represents Keyless SSL configuration.
+type KeylessSSL struct {
+	ID          string    `json:"id"`
+	Name        string    `json:"name"`
+	Host        string    `json:"host"`
+	Port        int       `json:"port"`
+	Status      string    `json:"success"`
+	Enabled     bool      `json:"enabled"`
+	Permissions []string  `json:"permissions"`
+	CreatedOn   time.Time `json:"created_on"`
+	ModifiedOn  time.Time `json:"modifed_on"`
+}
+
+// KeylessSSLResponse represents the response from the Keyless SSL endpoint.
+type KeylessSSLResponse struct {
+	Response
+	Result []KeylessSSL `json:"result"`
+}
+
+// CreateKeyless creates a new Keyless SSL configuration for the zone.
+//
+// API reference: https://api.cloudflare.com/#keyless-ssl-for-a-zone-create-a-keyless-ssl-configuration
+func (api *API) CreateKeyless() {
+}
+
+// ListKeyless lists Keyless SSL configurations for a zone.
+//
+// API reference: https://api.cloudflare.com/#keyless-ssl-for-a-zone-list-keyless-ssls
+func (api *API) ListKeyless() {
+}
+
+// Keyless provides the configuration for a given Keyless SSL identifier.
+//
+// API reference: https://api.cloudflare.com/#keyless-ssl-for-a-zone-keyless-ssl-details
+func (api *API) Keyless() {
+}
+
+// UpdateKeyless updates an existing Keyless SSL configuration.
+//
+// API reference: https://api.cloudflare.com/#keyless-ssl-for-a-zone-update-keyless-configuration
+func (api *API) UpdateKeyless() {
+}
+
+// DeleteKeyless deletes an existing Keyless SSL configuration.
+//
+// API reference: https://api.cloudflare.com/#keyless-ssl-for-a-zone-delete-keyless-configuration
+func (api *API) DeleteKeyless() {
+}