feat(Next.JS): Support server-side Next.JS usage

Next.JS disallows relative imports since 12.0.1 (see
https://nextjs.org/docs/messages/middleware-relative-urls for more
information).  So, we need to sniff out if we are in the NEXTJS
environment and if so, use the fallback URL.

This should resolve:
#174

[ Testing: deno task build ]

src/core/libs/cardano_message_signing/cardano_message_signing.generated.js

@@ -3811,7 +3811,7 @@ export function isInstantiated() {
  */
 async function instantiateModule(opts) {
   // Temporary exception for fresh framework
-  const wasmUrl = import.meta.url.includes("_frsh")
+  const wasmUrl = (import.meta.url.includes("_frsh") || (globalThis.process?.env?.NEXT_RUNTIME !== undefined))
     ? opts.url
     : new URL("cardano_message_signing_bg.wasm", import.meta.url);
   const decompress = opts.decompress;

src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib.generated.js

@@ -28596,7 +28596,7 @@ export function isInstantiated() {
  */
 async function instantiateModule(opts) {
   // Temporary exception for fresh framework
-  const wasmUrl = import.meta.url.includes("_frsh")
+  const wasmUrl = (import.meta.url.includes("_frsh") || (globalThis.process?.env?.NEXT_RUNTIME !== undefined))
     ? opts.url
     : new URL("cardano_multiplatform_lib_bg.wasm", import.meta.url);
   const decompress = opts.decompress;