Add support for JSON output format

[roele]

While the current output format (table) is suitable for use by humans a more technical output such as JSON would make it easier to use the tool for other purposes and extract single values for example.

Later even more formats like YAML etc. could be added as well.

[dkorunic]

Sorry, this will need some refactoring to be able to merge in -- do you want me to do this or you feel up to it?

[roele]

@dkorunic i will rebase this and get it merge ready again

[roele]

@dkorunic I rebased the PR incorporating your recent changes. While doing so, i took the liberty add a table title and turn the new --ascii flag into an output type ascii. Give it a spin and let me know what you think.

OT: Merging the changes was quite a struggle, it seems that VS Code does not like CGO and my entire system freezes every couple keystrokes, possibly due to regenerating CGO definitions in the background.

[dkorunic]

@roele Looks great, I'll merge and release ASAP!
In regards to CGO, it is definitely causing pains for gopls, I agree. I tend to see slowdowns even in vim-go, although Goland works great (since it doesn't rely on gopls).

[roele]

@dkorunic Guess this can be closed, right?

[dkorunic]

Right, thanks again @roele for your patches, they've made the output and flexibility significantly better!