add timeout flag to wait-api command

[travisperson]

This should maintain the same behavior, except with a change that an error ERROR: context canceled will be printed when the command is killed with ctrl-c, as opposed to no error prior.

[codecov]

Codecov Report

Merging #7592 (60b3ae2) into master (e0a9cae) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7592      +/-   ##
==========================================
- Coverage   39.88%   39.77%   -0.12%     
==========================================
  Files         633      633              
  Lines       67098    67104       +6     
==========================================
- Hits        26765    26693      -72     
- Misses      35740    35798      +58     
- Partials     4593     4613      +20     

Impacted Files	Coverage Δ
cli/wait.go	0.00% <0.00%> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
markets/loggers/loggers.go	89.28% <0.00%> (-10.72%)	⬇️
chain/stmgr/call.go	67.87% <0.00%> (-7.28%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
storage/wdpost_sched.go	75.24% <0.00%> (-5.95%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
node/hello/hello.go	63.63% <0.00%> (-3.41%)	⬇️
miner/miner.go	55.62% <0.00%> (-1.99%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-1.96%)	⬇️
... and 15 more

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