Pull request: hup-reload

Merge in DNS/adguard-home from hup-reload to master

Squashed commit of the following:

commit 5cd4ab85bdc7544a4eded2a61f5a5571175daa44
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 7 19:58:17 2022 +0300

    next: imp signal hdlr

commit 8fd18e749fec46982d26fc408e661bd802586c37
Merge: a8780455 f1dd3334
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 7 19:46:48 2022 +0300

    Merge branch 'master' into hup-reload

commit a87804550e15d7fe3d9ded2e5a736c395f96febd
Merge: 349dbe54 960a7a75
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 7 15:49:23 2022 +0300

    Merge branch 'master' into hup-reload

commit 349dbe54fe27eeaf56776c73c3cc5649018d4c60
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 7 15:43:52 2022 +0300

    next: imp docs, names

commit 7287a86d283489127453009267911003cea5227e
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 7 13:39:44 2022 +0300

    WIP all: impl dynamic reconfiguration

internal/next/configmgr/config.go

@@ -0,0 +1,40 @@
+package configmgr
+
+import (
+	"net/netip"
+
+	"github.com/AdguardTeam/golibs/timeutil"
+)
+
+// Configuration Structures
+
+// config is the top-level on-disk configuration structure.
+type config struct {
+	DNS  *dnsConfig  `yaml:"dns"`
+	HTTP *httpConfig `yaml:"http"`
+	// TODO(a.garipov): Use.
+	SchemaVersion int `yaml:"schema_version"`
+	// TODO(a.garipov): Use.
+	DebugPprof bool `yaml:"debug_pprof"`
+	Verbose    bool `yaml:"verbose"`
+}
+
+// dnsConfig is the on-disk DNS configuration.
+//
+// TODO(a.garipov): Validate.
+type dnsConfig struct {
+	Addresses       []netip.AddrPort  `yaml:"addresses"`
+	BootstrapDNS    []string          `yaml:"bootstrap_dns"`
+	UpstreamDNS     []string          `yaml:"upstream_dns"`
+	UpstreamTimeout timeutil.Duration `yaml:"upstream_timeout"`
+}
+
+// httpConfig is the on-disk web API configuration.
+//
+// TODO(a.garipov): Validate.
+type httpConfig struct {
+	Addresses       []netip.AddrPort  `yaml:"addresses"`
+	SecureAddresses []netip.AddrPort  `yaml:"secure_addresses"`
+	Timeout         timeutil.Duration `yaml:"timeout"`
+	ForceHTTPS      bool              `yaml:"force_https"`
+}