feat: implement license parser and validation logic

[juev]

We need to parse all source code files for Flant licenses, and we must distinguish between CE and EE licenses.

Previously, we checked for licenses based on keywords. Now, this must be done through full-text analysis.

Example:

🐒 [license (#module)]
     Message:      license header does not match any known license
     Module:       ingress-nginx
     FilePath:     images/controller-1-9/nginx-chroot-wrapper.sh

file content:

#!/bin/bash

# Copyright 2022 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

cat /etc/resolv.conf > /chroot/etc/resolv.conf
unshare  -S 101 -R /chroot /usr/local/nginx/sbin/nginx "$@"