[EPIC] Dashboards-as-code for UCX

[nfx]

Subset of #106

• [x] https://github.com/databrickslabs/lsql/issues/141
• [x] https://github.com/databrickslabs/lsql/issues/112
• [x] https://github.com/databrickslabs/lsql/issues/130
• [x] https://github.com/databrickslabs/lsql/issues/131
• [x] https://github.com/databrickslabs/lsql/issues/148
• [x] https://github.com/databrickslabs/lsql/issues/133
• [x] https://github.com/databrickslabs/lsql/issues/135
• [ ] https://github.com/databrickslabs/lsql/issues/127
• [x] https://github.com/databrickslabs/lsql/issues/137
• [x] https://github.com/databrickslabs/lsql/issues/110
• [x] https://github.com/databrickslabs/lsql/issues/114
• [x] https://github.com/databrickslabs/lsql/issues/158
• [x] https://github.com/databrickslabs/lsql/issues/159
• [x] https://github.com/databrickslabs/lsql/issues/163
• [x] https://github.com/databrickslabs/lsql/issues/165
• [x] https://github.com/databrickslabs/lsql/issues/169
• [x] https://github.com/databrickslabs/lsql/issues/175
• [x] https://github.com/databrickslabs/lsql/issues/187
• [x] https://github.com/databrickslabs/lsql/issues/191
• [x] https://github.com/databrickslabs/lsql/issues/122