Object list export should match the current table view

[jeremystretch]

Environment

• Python version: 3.6.9
• NetBox version: 2.8.9

Proposed Functionality

Rework the built-in CSV export functionality to export only the data shown in the table, with the columns in the same order.

Use Case

Following the implementation of #492, users are now able to customize object lists by adding, removing, and rearranging table columns. However, the default CSV export for each model is static and does not change. Allowing the CSV export to dynamically adapt along with the table display provides a more consistent user experience and obviates the need for writing custom export templates for minor changes. We also may be able to leverage the built-in export functionality that django-tables2 provides.

Database Changes

None

External Dependencies

tablib will be required if we opt to use django-tables2's export functionality.

[ryanmerolle]

Bumped to v2.11 given the amount of work gating this and a lack of focus for it immediately.

[jeremystretch]

Blocked by #5926