[ts][go] Add memory token provider for storing auth tokens

[fundthmcalculus]

This is better done before the node/web SDK package changes, so here's the PR for go and typescript. Not a blocker for release of 1.7.0, but nice to have.

[codecov-commenter]

Codecov Report

Merging #901 (6fbdbc2) into main (224a631) will increase coverage by 44.03%.
The diff coverage is 34.61%.

❗ Current head 6fbdbc2 differs from pull request most recent head cf866ce. Consider uploading reports for the commit cf866ce to get more accurate results

@@            Coverage Diff            @@
##           main     #901       +/-   ##
=========================================
+ Coverage      0   44.03%   +44.03%     
=========================================
  Files         0       14       +14     
  Lines         0     1022     +1022     
=========================================
+ Hits          0      450      +450     
- Misses        0      489      +489     
- Partials      0       83       +83     

Impacted Files	Coverage Δ
go/services/account_service.go	40.28% <16.66%> (ø)
go/services/token_provider.go	30.76% <30.76%> (ø)
go/services/service_base.go	61.62% <57.14%> (ø)
go/services/template_service.go	30.30% <0.00%> (ø)
go/services/security.go	65.71% <0.00%> (ø)
go/services/trustregistry_service.go	34.40% <0.00%> (ø)
go/services/loadcerts.go	0.00% <0.00%> (ø)
go/services/provider_service.go	32.73% <0.00%> (ø)
... and 6 more

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