program: multiple makers for spot

[crispheaney]

Todos:

Current pr:

• sdk changes to handle passing in multiple makers to fill_spot
• additional cargo tests

Future prs:

• Add spot fallback price based on oracle and historical bid/ask
• update auction params for spot orders
• allow place and take to work w auction end price for spot, similar to perp

[codecov]

Codecov Report

Merging #946 (a29265b) into master (8b76cc0) will increase coverage by 0.36%.
The diff coverage is 95.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
+ Coverage   74.87%   75.23%   +0.36%     
==========================================
  Files         131      131              
  Lines       32322    32705     +383     
==========================================
+ Hits        24200    24607     +407     
+ Misses       8122     8098      -24     

Components	Coverage Δ
drift	75.41% <95.13%> (+0.36%)	⬆️