feat: allow to read a configuration file

examples/schema.toml

@@ -19,6 +19,56 @@ type = "Integer"
 not_null = true
 reference = { table = "categories", identity = "id", label = "Category Id" }
 
+[public.entries]
+display_name = "Entries"
+
+[[public.entries.columns]]
+name = "id"
+type = "Integer"
+default = "nextval('entries_id_seq'::regclass)"
+not_null = true
+
+[[public.entries.columns]]
+name = "date"
+type = "Date"
+default = "CURRENT_TIMESTAMP"
+not_null = true
+
+[[public.entries.columns]]
+name = "source_id"
+type = "Integer"
+not_null = true
+reference = { table = "sources", identity = "id", label = "Source Id" }
+
+[[public.entries.columns]]
+name = "uid"
+not_null = true
+type = { Varchar = {} }
+
+[[public.entries.columns]]
+name = "text"
+type = "Text"
+not_null = false
+
+[public.categories]
+display_name = "Categories"
+
+[[public.categories.columns]]
+name = "id"
+type = "Integer"
+default = "nextval('category_id_seq'::regclass)"
+not_null = true
+
+[[public.categories.columns]]
+name = "name"
+not_null = true
+type = { Varchar = { length = 20 } }
+
+[[public.categories.columns]]
+name = "uid"
+not_null = false
+type = { Varchar = { length = 8 } }
+
 [public.sources]
 display_name = "Sources"
 
@@ -58,53 +108,3 @@ type = { TimestampWithTimeZone = { precision = 6 } }
 name = "deleted_at"
 not_null = false
 type = { TimestampWithTimeZone = { precision = 6 } }
-
-[public.categories]
-display_name = "Categories"
-
-[[public.categories.columns]]
-name = "id"
-type = "Integer"
-default = "nextval('category_id_seq'::regclass)"
-not_null = true
-
-[[public.categories.columns]]
-name = "name"
-not_null = true
-type = { Varchar = { length = 20 } }
-
-[[public.categories.columns]]
-name = "uid"
-not_null = false
-type = { Varchar = { length = 8 } }
-
-[public.entries]
-display_name = "Entries"
-
-[[public.entries.columns]]
-name = "id"
-type = "Integer"
-default = "nextval('entries_id_seq'::regclass)"
-not_null = true
-
-[[public.entries.columns]]
-name = "date"
-type = "Date"
-default = "CURRENT_TIMESTAMP"
-not_null = true
-
-[[public.entries.columns]]
-name = "source_id"
-type = "Integer"
-not_null = true
-reference = { table = "sources", identity = "id", label = "Source Id" }
-
-[[public.entries.columns]]
-name = "uid"
-not_null = true
-type = { Varchar = {} }
-
-[[public.entries.columns]]
-name = "text"
-type = "Text"
-not_null = false