fix: move types condition to the front

[Andarist]

Note: the socket.io.js file is the generated output of make socket.io.js, and should not be manually modified.

The kind of change this PR does introduce

• a bug fix
• a new feature
• an update to the documentation
• a code change that improves performance
• other

I moved types condition to the front. package.json#exports are order-sensitive - they are always matched from the top to the bottom. When a match is found then it should be used and no further matching should occur.

Right now, the current setup works in TypeScript but it's considered a bug and it should not be relied upon, see the thread and the comment here. For that reason, I would like to fix all popular packages that misconfigured their exports this way so the bug can be fixed in TypeScript.