feat: implement empty state for tables

[kantord]

fixes #160

Notes

• I took some liberty with the copy because the copy in the design refers to "interactions", not alerts. We have not implemented this change yet, so to keep it logical and consistent with the current behavior, I rewrote it slightly
• In order to detect if we need to show the setup instructions in the empty table, I use the following heuristic: if the user has multiple workspaces, we will show a message that explains how workspaces work, instead of explaining the basic setup. This makes sense imo, because a user having multiple workspaces is likely to be confused about how workspaces work

Screenshots

[coveralls]

Pull Request Test Coverage Report for Build 13054952285

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 73.338%

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Totals
Change from base Build 13054225475:	0.2%
Covered Lines:	770
Relevant Lines:	985

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💛 - Coveralls