Swap: Add public offer to GetInfo

[TheCharlatan]

Adds a public_offer to each swap state. Not sure if the swap state is the correct place to put it, as opposed to the Runtime, would be great to get your comment on this @zkao.

Also cleans up the swap GetInfo struct a bit.

Closes #458

[codecov-commenter]

Codecov Report

Merging #524 (b7fcc41) into main (48c9de5) will increase coverage by 0.0%.
The diff coverage is 0.0%.

@@          Coverage Diff          @@
##            main    #524   +/-   ##
=====================================
  Coverage   12.1%   12.1%           
=====================================
  Files         34      34           
  Lines      10290   10268   -22     
=====================================
  Hits        1241    1241           
+ Misses      9049    9027   -22     

Impacted Files	Coverage Δ
src/rpc/request.rs	17.8% <0.0%> (+<0.1%)	⬆️
src/swapd/runtime.rs	0.0% <0.0%> (ø)
src/swapd/swap_state.rs	0.0% <0.0%> (ø)

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[zkao]

Not sure if the swap state is the correct place to put it, as opposed to the Runtime, would be great to get your comment on this @zkao.

i would put this straight up on the runtime, because its not state machine related

[TheCharlatan]

i would put this straight up on the runtime, because its not state machine related
Done.

[zkao]

lgtm