use AnalyticsRepo to enqueue NFT analytics events

[smk762]

Fixes bug blocking NFT withdraws. Previously the errors below would happen on click.

AppBlocObserver -> onError
NftWithdrawBloc: Bad state: GetIt: Object/factory with type AnalyticsBloc is not registered inside GetIt. 
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
Did you forget to register it?)
Trace: #0      throwIfNot (package:get_it/get_it_impl.dart:14)
#1      _GetItImplementation._findRegistrationByNameAndType (package:get_it/get_it_impl.dart:583)
#2      _GetItImplementation._get (package:get_it/get_it_impl.dart:641)
#3      _GetItImplementation.get (package:get_it/get_it_impl.dart:608)
#4      _GetItImplementation.call (package:get_it/get_it_impl.dart:720)
#5      NftWithdrawBloc._onSend (package:web_dex/bloc/nft_withdraw/nft_withdraw_bloc.dart:103)
<asynchronous suspension>
#6      Bloc.on.<anonymous closure>.handleEvent (package:bloc/src/bloc.dart:226)
<asynchronous suspension>

[ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: Bad state: GetIt: Object/factory with type AnalyticsBloc is not registered inside GetIt. 
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
Did you forget to register it?)
#0      throwIfNot (package:get_it/get_it_impl.dart:14)
#1      _GetItImplementation._findRegistrationByNameAndType (package:get_it/get_it_impl.dart:583)
#2      _GetItImplementation._get (package:get_it/get_it_impl.dart:641)
#3      _GetItImplementation.get (package:get_it/get_it_impl.dart:608)
#4      _GetItImplementation.call (package:get_it/get_it_impl.dart:720)
#5      NftWithdrawBloc._onSend (package:web_dex/bloc/nft_withdraw/nft_withdraw_bloc.dart:103)
<asynchronous suspension>
#6      Bloc.on.<anonymous closure>.handleEvent (package:bloc/src/bloc.dart:226)
<asynchronous suspension>

To Test:

• attempt to withdraw an NFT. If you succeeds, it worked.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/nft-withdraw

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[github-actions]

Visit the preview URL for this PR (updated for commit 30c9e94):

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[CharlVS]

Thanks for catching this one :)

Blocs should never be referencing other blocs. They can only share repositories (and repositories should hold little/no state). This ensures that the app's business logic is neatly separated into independant "silos" which can be changed/removed without worrying about breaking other parts of the app.