fix: WASM MIME type in Nginx config

[rajivshah3]

Description of change

This PR adds a config file that will tell Nginx to send .wasm files with the Content-Type as application/wasm instead of application/octet-stream. This allows us to use streaming compilation, which may help performance with page loading. It also resolves this warning:

`WebAssembly.instantiateStreaming` failed because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:
 TypeError: Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.

Additionally, when the explorer is proxied through Cloudflare, the application/wasm also lets Cloudflare know that it can compress the WASM. In the case of the SDK WASM, Cloudflare will use Brotli to compress it from 6.3 MB to 1.8 MB, further improving the page load time.

Close #1430

Type of change

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

• Verified that SDK WASM loads
• Verified that page loads without errors

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes

[begonaalvarezd]

Approved but awaiting for @shufps approval

[shufps]

lgtm 👌