expand transform-functions with examples

[judell]

No description provided.

[johnsmyth]

@judell It feels to me like this level of doc should be in the SDK instead of here. Maybe we should just include the table, but link to SDK docs instead of putting all the detail and examples here? I don't find that the examples for each add all that much, but they make the content much more dense.

[judell]

@johnsmyth We could indeed link over to https://pkg.go.dev/github.com/turbot/steampipe-plugin-sdk/v5@v5.10.0/plugin/transform which has fragIDs for these things, like https://pkg.go.dev/github.com/turbot/steampipe-plugin-sdk/v5@v5.10.0/plugin/transform#hdr-FromField. And then slightly expand on each of the explanations there. In the case of FromJSONTag, for example, it's helpful to see the JSON tags in an SDK and compare with corresponding column definitions. For plugin developers who are new to Go (not uncommon) that kind of thing is useful context.

I'll ask for some additional feedback on this from a plugin developer.