misc(proto): add package name

[derekperkins]

I picked a package name that seemed reasonable, open to suggestions if there are any preferences
Fixes #15115

[connorjclark]

I don't suspect anyone but us actually uses the proto definition (if you are, please drop us a line as we are just curious!). But yeah this package name is good for us, thanks for the PR!

[derekperkins]

We're starting to use the proto for long term storage of Lighthouse results. Not sure if there's other usage, but it makes it so much easier to work in other languages outside js without having to define and manage our own types

[unmultimedio]

Hello @connorjclark! two small questions:

• Would it be possible to move the file into a directory that matches the package name, with a valid version? I'm interested in mainly these 2 suggestions: PACKAGE_DIRECTORY_MATCH and PACKAGE_VERSION_SUFFIX.
• When could we expect a new stable semver release that includes this change? so we can start syncing this repository into the Buf Schema Registry, alongside other common community Protobuf modules? (reference).