make dynamically importing bun work

[Jarred-Sumner]

What does this PR do?

await import(eval("'bun')) previously did not work

Now it does, though it only exports bun on the default property because of obscure issues related to the JSC C API which is still partially in use

How did you verify your code works?

Added a test

[github-actions]

❌ @Jarred-Sumner 3 files with test failures on linux-x64:

• test/js/bun/test/test-test.test.ts
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/prisma/prisma.test.ts

View test output

^{#977d9d2aeb5d8ce405293aadd7aca7842b374646}

[github-actions]

❌ @Jarred-Sumner 3 files with test failures on linux-x64-baseline:

• test/js/bun/test/test-test.test.ts
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/prisma/prisma.test.ts

View test output

^{#977d9d2aeb5d8ce405293aadd7aca7842b374646}

[github-actions]

❌ @Jarred-Sumner 5 files with test failures on bun-darwin-aarch64:

• test/js/bun/test/test-test.test.ts
• test/js/deno/crypto/webcrypto.test.ts
• test/js/node/dns/node-dns.test.js
• test/js/node/watch/fs.watch.test.ts
• test/js/third_party/esbuild/esbuild-child_process.test.ts

View test output

^{#977d9d2aeb5d8ce405293aadd7aca7842b374646}

[github-actions]

❌ @Jarred-Sumner 7 files with test failures on bun-darwin-x64-baseline:

• test/js/bun/spawn/spawn-streaming-stdin.test.ts
• test/js/bun/spawn/spawn.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/bun/test/test-test.test.ts
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/webpack/webpack.test.ts
• test/js/web/timers/setTimeout.test.js

View test output

^{#977d9d2aeb5d8ce405293aadd7aca7842b374646}