## Description 

At the moment if only says `Cannot open wallet config file at xyz`
without giving any details. This PR fixes this, particularly the
sui.keystore loading error.

## Test Plan 

tested locally 
---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
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### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes
Give detailed error context when failing to load client.yaml