Enable filter on data.format

[perolavsvendsen]

Issue

304

Short description

• Add dataformat to the filter options, so that filtering is possible on data.format.
• Add .dataformat property on the Child class, change .format into alias for .dataformat

_We may consider deprecating .format at some point, to avoid guiding people into overwriting built-in format.

This may work as a mitigation for https://github.com/equinor/fmu-dataio/pull/492. However, note:

• Require data consumers to actively filter on supported formats ⚠️

An alternative would be to default to data.format="irap_binary" in the explorer, but this does not feel right.

Extra: Also improved testing of some other filters (assert that no results come back when filtering on non-existing value)

Pre-review checklist

• [x] Read through all changes. No redundant print() statements, commented-out code, or other remnants from the development. 👀
• [x] Make sure tests pass after every commit. ✅
• [X] New/refactored code is following same conventions as the rest of the code base. 🧬
• [x] New/refactored code is tested. ⚙
• [x] Documentation has been updated 🧾

Pre-merge checklist

• [ ] Commit history is consistent and clean. 👌

[perolavsvendsen]

Don't know if this is the best way of solving this, inputs appreciated 💬

[perolavsvendsen]

For some reason I missed that the .format property was already there on the Child object. I will have another look at this to make sure things are consistent.

Edit:

• Added .dataformat property, and changed existing .format property into alias for .dataformat.
• Updated docs (consistency)
• Updated notebook example