[IMP][15.0] mail: Add avatar when tagging name

[Theanhngo2905]

Current behavior before PR:

• Currently, when the username tag ('@') only shows the name, but in the case of multiple names that are the same, it is very easy to be mistakenly tagged.

  => Annoying unrelated people. People who need to know do not receive information

Desired behavior after PR is merged:

• Add avatar when tagging the person's name on the suggestion section

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[robodoo]

[Theanhngo2905]

@tuyenphung

[tranngocson1996]

@alexkuhn Can you review this PR. Thank bro cc: @tde-banana-odoo

[alexkuhn]

Hello, we don't do IMP in stable versions like 15.0, only FIX. So this is master work.

As for the IMP itself, would be best to group IM status and avatar in a similar way as other visual of avatar + im status in the bottom right: So that avatar + name are more apparent (and im_status is less visible, as it should be)

[tranngocson1996]

@alexkuhn thank for reply. So we can create this pr for master branch ?

[alexkuhn]

@tranngocson1996 Yes, can make a PR for master for such kind of IMP. Thanks!

[tranngocson1996]

@alexkuhn thank you. @Theanhngo2905 continue handle this pr