[IMP] hr_expense: improve mail gateaway

1/ Send mail notification if expense is registered successfully

Before this commit, when user submits the expense via email, user is not getting
information about whether expense is registered or not. After this commit user
will get a confirmation email.

Few other usability improvements,
- Improved tooltip for the field 'default_code' in expense's form and in the
'Emails' config setting.
- Added product's default code in product's kanban view
- Filtered uom based on category of product's uom.

2/ Better parsing of expense mail subject

Criteria for matching expense product from email subject is changed,
  - The product code should be the first word of the subject.
  - Only expense products are allowed, previously there was no filter and user was
    able to select any product in expense via mail.

Currency support is added,
  - Now user can specify currency symbols and ISO code in expense mail subject.
  - If subject contains multiple numbers in that case, number with currency will
    get higher priory, and it selected as an amount in expense.
  - If multi currency is active, user can use any active currency symbol/ISO code
    in mail subject. Respective currency will be selected in registered expense.
  - If multi currency is not active, user can only pass company currency. Other
    currencies are ignored and expense will be registered as default company currency
  - If user pass non active currency in subject then that currency will be ignored
    and expense will be registered as default company currency

Examples:
PROD_CODE 2 foo $1205.91 baz

Added python test cases for mail subject parsing.

Related to task #35093
closes #22168

Co-authored-by: Lucas Lefèvre <lul@odoo.com>

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