Added an event to dispatch

[ndkazu]

• In pallet_roles/set_manager dispatch, do not check that new and old manager are different accounts
• Ads an event to the pallet_onboarding/change_status dispatch function

Motivation

• Pallet roles

1. The sudo pallet_key cannot be attributed to more than one account
2. By Default, Alice has the sudo_key, but has no role.
   The sudo key should have the authority to attribute a role to himself. the set_role dispatch will only work if no role is attributed yet. The check implemented previously only prevent the sudo key to get a role during the Genesis stage of the pallet

• Pallet Onboarding
  An event makes it easier to track the status change, and see clearly if the corresponding calls are executed or not.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@d26f1b6). Click here to learn what that means.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##             main     #177   +/-   ##
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  Coverage        ?   76.76%           
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  Files           ?       49           
  Lines           ?     4119           
  Branches        ?        0           
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  Hits            ?     3162           
  Misses          ?      957           
  Partials        ?        0           

Impacted Files	Coverage Δ
pallets/roles/src/lib.rs	78.02% <ø> (ø)
pallets/onboarding/src/lib.rs	88.79% <83.33%> (ø)

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[ilhanu]

Nice Fix, and the event is very good to have.
🚀