Add support for additional build tags within wails project

[symball]

Is your feature request related to a problem? Please describe.

I find myself building an app with dependencies I would like to further control using build tags.

Rather than hope developers remember to include the tags argument at dev / build time, it would streamline development to have a property within the wails.json project specification for guaranteeing build tags are included

Describe the solution you'd like

Support for an extra field within the wails.json spec such as build:tags

Describe alternatives you've considered

There aren't really any alternatives for this proposal

Additional context

No response

[leaanthony]

We're aware of this annoyance and addressed it in v3. If you want to take on the work of adding this to v2 then I'm happy to accept a PR 👍