Rename column functionality

[roll]

• fixes Ability to edit header/labels #571
• fixes Column name is not updated after changing it in the metadata panel #574

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After deep investigation the conclusion was that it's basically impossible to keep all the editing functionality at the same time without falling into a rabbit hole and unmaintainable code. There are data changes, metadata changes, undo, redo + this feature requires special kind of changes -- DDL command on the database that affects both data and metadata.

I think the only robust solution is what is implemented in this PR:

• disabled field name editing in metadata
• disabled adding new fields in metadata (needs a new feature on the data grid -- create issue)
• disabled removing new fields in metadata (needs a new feature on the data grid -- create issue)
• column renaming is implemented a separate action available in the data grid
• currently, the column context menu is used because clicking on the column name does ordering

[romicolman]

@roll Basically, since the table headers are link to the filter feature, it is not possible to make column names editable, right? If that's the case, I think it is important to keep field name editing in metadata.

[roll]

@romicolman
Let's discuss it in the standup. It can be different kinds of UI (currently, it's a part of context menu) so different options are possible. What is really almost impossible is to keep it as part of metadata as this change requires to be atomic instead of being a part of change history

[romicolman]

OK! Perfect. Let's talk about it today.

[romicolman]

@roll let's go with this approach: add the Rename category to the filter, disable field name editing in metadata. I'll create separate issues for the rest of the changes we need to implement :)

[roll]

Thanks!

[guergana]

Thanks!

@roll is this PR ready for review now after the changes asked from Romina? 👀

[roll]

@guergana
Yes

[guergana]

@roll excellent work. I like the context menu solution. Maybe we should more functions to the context menu. It seems more intuitive and easier to understand than having to navigate to the metadata panel.

[roll]

Thanks!