chore: make anchor credential param optional and add default value

[fqutishat]

Signed-off-by: Firas Qutishat firas.qutishat@securekey.com

[codecov]

Codecov Report

Merging #821 (132618d) into main (d179dec) will increase coverage by 0.03%.
The diff coverage is 45.45%.

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
+ Coverage   89.45%   89.49%   +0.03%     
==========================================
  Files         144      144              
  Lines       12615    12615              
==========================================
+ Hits        11285    11290       +5     
+ Misses        821      815       -6     
- Partials      509      510       +1     

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/params.go	79.83% <45.45%> (-1.23%)	⬇️
pkg/observer/pubsub.go	97.22% <0.00%> (+2.77%)	⬆️
...pub/service/inbox/httpsubscriber/httpsubscriber.go	100.00% <0.00%> (+9.87%)	⬆️

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