Remove lcli block packing analysis (#3179)

## Proposed Changes

Remove the `lcli` code which performs block packing analysis.
The `lcli` code has been deprecated by a more performant version available in the HTTP API added in #2879.

## Additional Info

Any applications depending on the `lcli` code should migrate to the version in the HTTP API.
The only feature which is unavailable in the API version is an estimate of live/dead validators. This was originally used to determine a closer approximation of block packing efficiencies since offline validators have a disproportionate impact on efficiencies. However the implimentation in `lcli` is a poor approximation which cannot account for a multitude of factors. It is recommended to simply calculate relative efficiencies instead or use a more advanced method of determining live/dead validators.