fix: mobile bindings missing Orb options

[birsanf]

Signed-off-by: Florin Birsan [email protected]

added missing Orb options (SideetreeToken and DidAnchorOrigin)
moved test document loader into the vcwallet_test.go and moved the test contexts into testdata folder

[codecov]

Codecov Report

Merging #266 (9912451) into main (83a245a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   87.47%   87.47%           
=======================================
  Files          15       15           
  Lines        1126     1126           
=======================================
  Hits          985      985           
  Misses         83       83           
  Partials       58       58           

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