ci: add precommit and semantic commit workflow

* ci: add commitlint config file

* ci: add precommit config

* style: lint code

ci: fix ci

this is being done as erpnext's patch test needs a bit more thought
it currently installs v14, restores the site to v10 then starts migrating

* did a bit of cleanup via pre-commit
* added custom field creation/deletion via hooks
* add scheduler event for razorpay

db.get_value for singles returns string type always, this is confusing
behaviour, db.get_single_value should be used instead.

semgrep rule: https://github.com/frappe/semgrep-rules/pull/16

refactor: clean up code to py39+ supported syntax

- f-strings instead of format
- latest typing support instead of pre 3.9 TitleCase
- remove UTF-8 declarations.
- many more changes

Powered by https://github.com/asottile/pyupgrade/ + manual cleanups

A bare except catches lots of things (like generator iteration end) and should never be used.

refactor: Integration Request

Co-authored-by: Frappe Bot <developers@frappe.io>

chore: License fixes

The license.txt file has been replaced with LICENSE for quite a while
now. INAL but it didn't seem accurate to say "hey, checkout license.txt
although there's no such file". Apart from this, there were
inconsistencies in the headers altogether...this change brings
consistency.

These modules were imported from the ERPNext codebase into Frappe.
License header was overlooked at that point. These were contributed
initially by Frappe Technologies Pvt Ltd under GPLv3 (ERPNext's license) and now
we, as Frappe Technologies Pvt Ltd converting them to MIT to comply with
Frappe's license.

 Conflicts:

	frappe/__init__.py

# Conflicts:
#	frappe/__init__.py

chore: Dead dependencies and code cleanup

* Remove six for PY2 compatability since our dependencies are not, PY2
  is legacy.
* Removed usages of utils from future/past libraries since they are
  deprecated. This includes 'from __future__ ...' and 'from past...'
  statements.
* Removed compatibility imports for PY2, switched from six imports to
  standard library imports.
* Removed utils code blocks that handle operations depending on PY2/3
  versions.
* Removed 'from __future__ ...' lines from templates/code generators
* Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass