feat: file hashing for reusing builds

src/build/deps.ts

@@ -1,3 +1,2 @@
 export { crypto } from "https://deno.land/std@0.208.0/crypto/mod.ts";
 export { encodeHex } from "https://deno.land/std@0.208.0/encoding/hex.ts";
-export * as tjs from "npm:typescript-json-schema@^0.62.0";

src/build/mod.ts

@@ -1,5 +1,5 @@
 import { assertExists, exists, join } from "../deps.ts";
-import { crypto, encodeHex, tjs } from "./deps.ts";
+import { crypto, encodeHex } from "./deps.ts";
 import { compileSchema } from "./schema.ts";
 import { generateEntrypoint } from "./entrypoint.ts";
 import { generateOpenApi } from "./openapi.ts";