Test: refactored hex editor

[connor4312]

Ref #15756

• anyOS @lszomoru
• anyOS @joyceerhl

Complexity: 5

Authors: @connor4312, @lramos15

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As part of support for debugger memory, we wanted to refactor the hex editor to support arbitrarily large files. This was a significant set of changes. While we still use extension host APIs which only support reading entire files into memory, the infrastructure is there to remove this restriction and add use cases and we focused on reaching parity with the previous version of the hex editor.

Therefore, please go through the hex editors and verify everything works using this vsix:
hexeditor-1.8.2.vsix.zip

• Viewing of bytes and scrolling works
• Navigation works via keyboard
• Selections work. Selections can be added/altered with modifier keys
• Editing bytes work. Edits should be shown with a diff background (blue by default) while unsaved
• Undo/redo works
• Find works (ctrl/cmd+F for the widget as usual). The total number of results is limited to 10k by default, but can be increased by clicking the result number.
• Find and replace works
• The data inspector works
• The "Hex Editor: Go to Offset" command works