Feat/button send email after manual crm lead

CHANGELOG:

### Added
- [#1102](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1102) Add button to send new email for manually created leads

Related card: https://trello.com/c/85fmnCLx/1734-nova-plantilla-creaci%C3%B3-crmlead-manual

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