feat(eventstore): increase parallel write capabilities (#5940)

This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and  [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.

internal/eventstore/version_test.go

@@ -0,0 +1,39 @@
+package eventstore
+
+import "testing"
+
+func TestVersion_Validate(t *testing.T) {
+	tests := []struct {
+		name    string
+		v       Version
+		wantErr bool
+	}{
+		{
+			"correct version",
+			"v1.23.23",
+			false,
+		},
+		{
+			"no v prefix",
+			"1.2.2",
+			true,
+		},
+		{
+			"letters in version",
+			"v1.as.3",
+			true,
+		},
+		{
+			"no version",
+			"",
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.v.Validate(); (err != nil) != tt.wantErr {
+				t.Errorf("Version.Validate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}