feat: add Talos events sink proto files and the reference implementation

This PR adds protocol definitions for the events sink gRPC service.
The executable `events-sink` is a reference implementation fo the
service that simply logs all incoming events.

Signed-off-by: Artem Chernyshev <artem.chernyshev@talos-systems.com>

.codecov.yml

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+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-11-18T14:01:40Z by kres 8d6311a-dirty.
+
+codecov:
+  require_ci_to_pass: false
+
+coverage:
+  status:
+    project:
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+        target: 50%
+        threshold: 0.5%
+        base: auto
+        if_ci_failed: success
+    patch: off
+
+comment: false

.conform.yaml

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+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-11-18T14:01:40Z by kres 8d6311a-dirty.
+
+---
+policies:
+- type: commit
+  spec:
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+    gpg:
+      required: true
+      identity:
+        gitHubOrganization: talos-systems
+    spellcheck:
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+    maximumOfOneCommit: true
+    header:
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+      imperative: true
+      case: lower
+      invalidLastCharacters: .
+    body:
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+    conventional:
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+      scopes: [".*"]
+- type: license
+  spec:
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+      - testdata/
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+      - .go
+    excludeSuffixes:
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+    header: "// This Source Code Form is subject to the terms of the Mozilla Public\u000A// License, v. 2.0. If a copy of the MPL was not distributed with this\u000A// file, You can obtain one at http://mozilla.org/MPL/2.0/.\u000A"

.dockerignore

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+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-11-18T14:01:40Z by kres 8d6311a-dirty.
+
+**
+!api
+!cmd
+!pkg
+!go.mod
+!go.sum
+!.golangci.yml
+!README.md
+!.markdownlint.json