feat: Add a new dashboard UI to Daft

[raunakab]

Overview

This PR introduces a new sub-directory, called /dashboard, that contains a Next.js dashboard application. The UI is styled using shadcn.

Notes

The current dashboard is quite simple; it only contains the basic frame, two items in the sidebar, and a blank screen.

The dashboard currently looks like:

[codspeed-hq]

CodSpeed Performance Report

Merging #3738 will degrade performances by 18.22%

_{Comparing dashboard (0efb166) with main (78beff4)}

Summary

❌ 1 regressions
✅ 26 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_iter_rows_first_row[100 Small Files]	153.1 ms	187.2 ms	-18.22%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.51%. Comparing base (960f144) to head (0efb166).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3738      +/-   ##
==========================================
- Coverage   77.58%   77.51%   -0.07%     
==========================================
  Files         729      731       +2     
  Lines       92003    92511     +508     
==========================================
+ Hits        71378    71714     +336     
- Misses      20625    20797     +172     

see 45 files with indirect coverage changes

[jaychia]

Seems fine, can we also check the binary sizes/amount of stuff we have to download for the dashboard? Would definitely like to keep it lightweight if possible.

Also if possible, lets remove any runtime dependencies on bun, prometheus and grafana