feat: Added GetBulkAsRawMap function to the MongoDB API

[bstasyszyn]

GetBulkAsRawMap returns a slice of 'raw' maps, one for each of the specified keys.

Also exposed PrepareFilter and CreateMongoDBFindOptions so that clients may prepare queries for use with the QueryCustom function.

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov[bot]]

Codecov Report

Merging #259 (1457bfd) into main (55b4fab) will increase coverage by 2.41%. The diff coverage is 66.66%.

:exclamation: Current head 1457bfd differs from pull request most recent head be0461a. Consider uploading reports for the commit be0461a to get more accurate results

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   85.82%   88.23%   +2.41%     
==========================================
  Files          26        1      -25     
  Lines        3992      799    -3193     
==========================================
- Hits         3426      705    -2721     
+ Misses        334       52     -282     
+ Partials      232       42     -190     

Impacted Files	Coverage Δ
component/storage/mongodb/store.go	88.23% <66.66%> (-1.74%)	:arrow_down:
...nt/vdr/trustbloc/config/signatureconfig/helpers.go
...vdr/trustbloc/selection/staticselection/service.go
...omponent/vdr/trustbloc/didconfiguration/helpers.go
component/storage/mysql/store.go
...nt/vdr/trustbloc/config/verifyingconfig/service.go
component/vdr/orb/internal/ldcontext/ldcontext.go
component/vdr/trustbloc/endpoint/service.go
component/vdr/sidetree/option.go
... and 17 more

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