feat: Add broker selector on login (#283)

* feat: Add broker selector on login

- Add broker login selector allowing users to choose between available brokers (DeGiro, Bitvavo, IBKR)

* fix: Extract Duplicate Credential Validation Logic

* fix: Replace Hardcoded Session Keys with Constants

* fix: Extract Duplicate Loading State Component

* fix: Complete IBKR Placeholder Implementation

* fix: set "Remember Me" to true for Bitvavo and IBKR login dialogs

These dialogs use tokens, which are less sensitive than credentials, and take longer to retrieve, so setting the "Remember Me" to `true` by default is a sensitive approach

* fix: Remove unneeded button in the loading dialog

* fix: Fixed links to login documentation

* fix: Use BrokerFactory for All Service Instantiation

Unify the instantiation of Authentication services to use the BrokerFactory

* fix: Fixed DEGIRO login workflow

DEGIRO was not `enabled` during the login process

* fix: tweaked the loading dialog

Removed the "Need help?" footer from the loading dialog

* chore: Update `PENDING_TASKS.md` document

Author: ctasada

CHANGELOG.md

@@ -11,6 +11,10 @@ _This project follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) a
 ### Added
 
 - **Configuration:** Added support to configure IBKR broker
+- **Broker Selector:**
+  - When starting now it's possible to choose the broker. This allows to use any of the available brokers, and removes
+  a limitation that was enforcing to have a DEGIRO account
+  - Adds possibility to use *only** DEGIRO, Bitvavo or IBKR
 
 ### Changed