[x/staking/LSM] reporting on rounding and truncation precision for tokenized shares

[texasspurstar]

Summary

This is a short follow-up on the state of the LSM module after a series of audits is drawing to a close.

Findings are only relevant to cosmos-sdk v0.50.x-lsm releases used on the Cosmos Hub.

While no significant issues were found, some smaller issues were already fixed and will be part of the next cosmos-sdk-lsm release.

For posterity, we're posting 2 informational findings that could inform future decisions around the x/staking modifications to support LSM that were first introduced in gaiad v12.0.0.