Added ESBuild minification in configuration minify=true, it can be ad…

…ded to specific environments or inherited from top-level and flags --minify which will minify script for publish and remote Dev.

Benefits:
- The script minification will allow for more code to the edge while not reaching the 1MB limit.
- Obfuscation of code in script.
resolves #785

packages/wrangler/src/config/environment.ts

@@ -181,7 +181,7 @@ interface EnvironmentInheritable {
    * Minify the script before uploading.
    * @inheritable
    */
-  minify: boolean | undefined;
+  minify?: boolean | undefined;
 
   /**
    * TODO: remove this as it has been deprecated.

packages/wrangler/src/dev/dev.tsx

@@ -43,7 +43,7 @@ export type DevProps = {
   compatibilityDate: string;
   compatibilityFlags: undefined | string[];
   usageModel: undefined | "bundled" | "unbound";
-  minify?: boolean;
+  minify?: boolean | undefined;
   build: {
     command?: undefined | string;
     cwd?: undefined | string;