[ADD] reveal_service : allow user to generate leads based on filters

Purpose :

Allow the user to generate a certain number of leads based on certain criteria like localization, technologies used, or size.

Available filters are :

- company size
- localization (country and states)
- industries
- technologies

The user can also ask for a few contacts that can be filtered based on
their role or seniority.

Each company found generates a new lead/opportunity for which the sales
team, salesperson and tags can be preset from the lead mining request.

This commit includes the followings changes :

- New module crm_iap_lead
- New model crm.iap.lead.helpers which contains helper methods used by
both modules crm_iap_lead and crm_iap_lead_website
- New model crm.iap.lead.mining.request that holds the data of a lead
mining request
- An option in the CRM settings to install this feature
- New button 'Generate Leads' in the leads/opportunity ListView and
KanbanView that opens a modal allowing to create a lead mining request
- New section 'Lead Generation' in menuitem 'Configuration' of CRM

TaskID : 1902172

closes odoo/odoo#30189