Rename src/bundler.zig to src/transpiler.zig

[Jarred-Sumner]

What does this PR do?

It has been the transpiler and not the bundler for a long time now

How did you verify your code works?

[robobun]

^{Updated 2:00 AM PT - Dec 21st, 2024}

❌ @Jarred-Sumner, your commit 83accb3 has 1 failures in #8400:

• test/bundler/native-plugin.test.ts - segmentation fault on 🍎 14 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🍎 13 aarch64
• test/bundler/native-plugin.test.ts - 1 failing on 🪟 2019 x64
• test/bundler/native-plugin.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 12 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 22.04 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 24.04 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 20.04 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 22.04 x64-baseline
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 12 x64-baseline
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 22.04 x64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 24.04 x64-baseline
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 12 x64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 24.04 x64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 20.04 x64-baseline
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 20.04 x64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 3.20 aarch64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 3.20 x64
• test/bundler/native-plugin.test.ts - segmentation fault on 🐧 3.20 x64-baseline

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🧪   try this PR locally:

bunx bun-pr 15921