add pfm testing scripts

[riley-stride]

1. a->b->c pfm works. to verify:

• In config.go set HOST_CHAINS=(GAIA OSMO)
• open two terminal windows as described below
  • terminal 1 monitors the sender on A: while true; do gaiadl q bank balances $(gaiadl keys show gval1 -a) && echo "--------------" && sleep 1; done
  • terminal 2 monitors the receiver on C: while true; do osmosisdl q bank balances osmo1uk4ze0x4nvh4fk0xm4jdud58eqn4yxhrqyeqwq && echo "--------------" && sleep 1; done
• run sh dockernet/scripts/pfm/pfm_abc_default.sh
• watch the terminal windows to see C's balance increase after A's decreases.

2. pfm'ing + autopilot coin A thru chain A will work after upgrade but pfm'ing + autopilot coin A thru B won't work
   -there's a script that sends from atom from CH -> stride then from Stride -> osmosis, then tries to autopilot LS that ATOM from Osmosis. If fails.
   -there's a script pfm_to_autopilot_ls.sh that tries to PFM (a -> b -> autopilot-LS-on-a: stride -> osmosis -> stride (autopilot LS). It doesn't work right now. Because the autopilot step doesn't work.

[asalzmann]

lgtm!

[asalzmann]

I think since pfm was merged you can change the base branch and merge right to main