Fix PECL publish

[TingDaoK]

ISSUE:

• PECL will remove the php files from subdirectory while installing.

Fix:

• Move the php script that help to generate sub to main directory
• Fixed a bunch of error during prepare package for pecl
• Load the native extension before calling composer
• add github action to create the tar file after cut the release
• restructure a bit to be more clear

Windows issue:

• We have a fixed composer path from makefile. And using the makefile to create a script to run tests.
• We don't have CI

Fix:

• Use Makefile to get the path to the shared libs (extensions) via: generate-php-ini
• Updated run_tests.bat to get the path to composer.phar and accept passing in php path to override the default php
• Do the same thing we did for linux.

TODO:

• update README for windows and composer, PECL and releasing fixes for composer -- https://github.com/awslabs/aws-crt-php/pull/89
• Rewrite Scripts from shell script to python for multiple platform - https://github.com/awslabs/aws-crt-php/pull/87
• Automate release process - https://github.com/awslabs/aws-crt-php/pull/90
• Supports for PHP 8.1/8.2
• Make the native extension required for composer Maybe not do this, or aws-sdk-php will break as it requires the composer package from crt, but not the native extension. Or, aws-sdk-php should take aws-crt-php an optional dependency instead (suggest instead of require)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.