feat: Add ent-based sqlite3 storage

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/schema/client.go

@@ -0,0 +1,53 @@
+package schema
+
+import (
+	"github.com/facebook/ent"
+	"github.com/facebook/ent/schema/field"
+)
+
+/* Original SQL table:
+create table client
+(
+    id            text    not null  primary key,
+    secret        text    not null,
+    redirect_uris blob    not null,
+    trusted_peers blob    not null,
+    public        integer not null,
+    name          text    not null,
+    logo_url      text    not null
+);
+*/
+
+// OAuth2Client holds the schema definition for the Client entity.
+type OAuth2Client struct {
+	ent.Schema
+}
+
+// Fields of the OAuth2Client.
+func (OAuth2Client) Fields() []ent.Field {
+	return []ent.Field{
+		field.Text("id").
+			SchemaType(textSchema).
+			NotEmpty().
+			Unique(),
+		field.Text("secret").
+			SchemaType(textSchema).
+			NotEmpty(),
+		field.JSON("redirect_uris", []string{}).
+			Optional(),
+		field.JSON("trusted_peers", []string{}).
+			Optional(),
+		field.Bool("public"),
+		field.Text("name").
+			SchemaType(textSchema).
+			NotEmpty(),
+		field.Text("logo_url").
+			SchemaType(textSchema).
+			NotEmpty(),
+	}
+}
+
+// Edges of the OAuth2Client.
+func (OAuth2Client) Edges() []ent.Edge {
+	return []ent.Edge{}
+}