[ADD] event_ticket_limit: add event ticket limiting module

Added event ticket limiting module allows users to control how many tickets a
Users can book in a single registration.

event_ticket_limit/__init__.py

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+from . import models

event_ticket_limit/__manifest__.py

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+{
+    "name": "Event Ticket Limit",
+    "summary": """
+        Module for limiting the number of tickets per registration
+    """,
+    "description": """
+        Module for limiting the number of tickets per registration
+    """,
+    "author": "Odoo",
+    "website": "https://www.odoo.com",
+    "category": "Event/ Event Ticket Limit",
+    "version": "0.1",
+    "installable": True,
+    "auto_install": True,
+    "depends": ["base_setup", "event", "website_event"],
+    "data": [
+        "views/event_tickets_views.xml",
+        "views/event_registration_website_view.xml",
+    ],
+    "license": "AGPL-3",
+}

event_ticket_limit/models/__init__.py

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+from . import event_ticket

event_ticket_limit/models/event_ticket.py

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+from odoo import fields, models
+
+
+class EventTicketInherit(models.Model):
+    _inherit = "event.event.ticket"
+
+    tickets_per_registration = fields.Integer(
+        string="Tickets per Registration",
+        help="Number of tickets per registration. 0 means unlimited.",
+    )

event_ticket_limit/views/event_registration_website_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <template id="modal_ticket_registration" name="modal_ticket_registration" inherit_id="website_event.modal_ticket_registration">
+        <xpath expr="//select[@class='w-auto form-select']" position="replace">
+            <select t-if="not ticket.is_expired and ticket.sale_available" t-attf-name="nb_register-#{ticket.id}" class="w-auto form-select">
+                <t t-set="seats_max_ticket" t-value="(not ticket.seats_limited or ticket.seats_available > 9) and 10 or ticket.seats_available + 1"/>
+                <t t-set="seats_max_event" t-value="(not event.seats_limited or event.seats_available > 9) and 10 or event.seats_available + 1"/>
+                <t t-set="seats_max_registration" t-value="ticket.tickets_per_registration+1 if ticket.tickets_per_registration else 10"/>
+                <t t-set="seats_max" t-value="min(seats_max_ticket, seats_max_event, seats_max_registration)"/>
+                <t t-foreach="range(0, seats_max)" t-as="nb">
+                    <option t-out="nb" t-att-selected="len(ticket) == 0 and nb == 0 and 'selected'"/>
+                </t>
+            </select>
+        </xpath>
+    </template>
+</odoo>

event_ticket_limit/views/event_tickets_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="event_event_ticket_view_tree_from_event_inherit_module_name" model="ir.ui.view">
+        <field name="name">event.event.ticket.view.list.inherit</field>
+        <field name="model">event.event.ticket</field>
+        <field name="inherit_id" ref="event.event_event_ticket_view_tree_from_event"/>
+        <field name="arch" type="xml">
+            <xpath expr="//list" position="inside">
+                <field name="tickets_per_registration" />
+            </xpath>
+        </field>
+    </record>
+</odoo>