cli: add new information to `display`

[2501babe]

im not going to further overburden #107, but after it lands, some nice things to add to the spl-single-pool display --verbose:

• excess lamports in main stake account
• stake and lamports in onramp
• whether the onramp exists

without --verbose maybe a little one-line indication of whether calling replenish-pool would be beneficial. perhaps add onramp stake to total in non-verbose (with some indication this is a total; we dont use onramp stake as part of deposit/withdraw token calculations just like we dont use loose lamports)

[2501babe]

im doing excess lamports now but holding off on onramp, the current pr is big enough

[2501babe]

this would be a good time to remove ProgramClient, i was going to do it during sdk removal but its not a priority for anything