Feat: authenticated calls in Candid UI (#475)

* initial setup

* feat: II login

* test: add allowed principal setter and getter in target canister

* fix: deactivate idle timeout

Co-authored-by: Ryan Vandersmith <ryanvandersmith@gmail.com>

* add: domain form

* change default identity provider

* comments and cleanup

* fix: remove target test canister from dfx.json

* remove target_test_canister

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Co-authored-by: Ryan Vandersmith <ryanvandersmith@gmail.com>
Co-authored-by: Yan Chen <48968912+chenyan-dfinity@users.noreply.github.com>