Feature: Certificate reference picker

[johnnyzhang82]

Fixed #1194

1. added certificate reference picker in create pool form
2. use a new button for certificate/app package upload button
3. fixed some misc issues

Certificate reference picker interface

Inner certificate reference interface

New upload certificate

New upload app package button

[codecov]

Codecov Report

Merging #1210 into master will decrease coverage by 0.14%.
The diff coverage is 32.82%.

@@            Coverage Diff             @@
##           master    #1210      +/-   ##
==========================================
- Coverage   53.38%   53.23%   -0.15%     
==========================================
  Files         946      948       +2     
  Lines       21538    21656     +118     
  Branches     2394     2413      +19     
==========================================
+ Hits        11497    11528      +31     
- Misses      10041    10128      +87

Impacted Files	Coverage Δ
app/models/forms/create-pool-model.ts	17.5% <0%> (-1.42%)	⬇️
...count/action/add/batch-account-create.component.ts	73.98% <0%> (ø)	⬆️
src/@batch-flask/core/record/navigable-record.ts	100% <100%> (ø)	⬆️
app/components/pool/action/add/index.ts	100% <100%> (ø)	⬆️
...inned-entity-dropdown/pinned-dropdown.component.ts	81.03% <100%> (ø)	⬆️
...nts/pool/action/add/certificate-reference/index.ts	100% <100%> (ø)
app/services/pinned-entity.service.ts	97.46% <100%> (ø)	⬆️
...l/action/add/pool-create-basic-dialog.component.ts	12.38% <15.38%> (-1.45%)	⬇️
...tificate-reference/certificate-picker.component.ts	28.28% <28.28%> (ø)
...tch-flask/ui/buttons/directory-picker.component.ts	31.57% <33.33%> (+0.32%)	⬆️
... and 2 more

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