feat: Auto-populate the telephone code based on the browser timezone (#10146)

Fixes https://github.com/chatwoot/chatwoot/issues/6228


There is a country code selector for the phone input field. This is
often a point of frustration. See the response below.

> We are using the phone number field however this can be frustrating
for customers, especially mobile users, to select the +1 US country
code. Our users are typically local businesses and being able to default
to +1 country code in the phone number field or the account would
improve the interaction they have with customers.


Most people who run local businesses don't need a country selector.
However, to preserve the quality of the data we store, we need a country
code.

A balance between these two issues can be found with an auto-populating
country code field based on the browser's timezone. This is what I did
in this PR. Based on the browser timezone, we will resolve it to the
closest country code.

package.json

@@ -56,6 +56,7 @@
     "color2k": "^2.0.2",
     "company-email-validator": "^1.0.8",
     "core-js": "3.11.0",
+    "countries-and-timezones": "^3.6.0",
     "date-fns": "2.21.1",
     "date-fns-tz": "^1.3.3",
     "dompurify": "2.2.7",
@@ -74,6 +75,7 @@
     "postcss-loader": "^4.2.0",
     "semver": "7.5.3",
     "tailwindcss": "^3.3.2",
+    "timezone-phone-codes": "^0.0.2",
     "tinykeys": "^2.1.0",
     "turbolinks": "^5.2.0",
     "url-loader": "^2.0.0",