feat: support ED25519 at subdomain gw with TLS

This:

- adds subdomain gateway support for ED25519 CIDs in a way that fits in
  a single DNS label to enable TLS for every IPNS website.

- cleans up subdomain redirect logic and adds more explicit error
  handling.

TL;DR on router logic:

When CID is longer than 63 characters, router at /ipfs/* and /ipns/*
converts to Base36, and if that does not help, returns a human readable
400 Bad Request error.

License: MIT
Signed-off-by: Marcin Rataj <lidel@lidel.org>

core/corehttp/hostname_test.go

@@ -180,5 +180,9 @@ func TestKnownSubdomainDetails(t *testing.T) {
 }
 
 func equalError(a, b error) bool {
+<<<<<<< HEAD
 	return (a == nil && b == nil) || (a != nil && b != nil && a.Error() == b.Error())
+=======
+	return a == nil && b == nil || a != nil && b != nil && a.Error() == b.Error()
+>>>>>>> feat: support ED25519 at subdomain gw with TLS
 }