fix(php): exclude most part of the repo for php package

[rtm-ctrlz]

This change excludes different languages from composer package, that will results in decrease of package size:

• packed .zip: from 4.8M to 0.2M (less traffic, faster installs)
• unpacked (in vendor directory): 22M->0.2M (smaller application dependencies, faster deploys)

What will be excluded from final package:

• other languages
• helpful repository files (.gitignore/.editorconfig/etc)
• compiler
• tests
• tutorial
• PHP sources/tests

What will final package contain of:

• README/LICENSE/CHANGES
• PHP library itself
• composer.json

There is no code change so [skip ci]

• Did you create an Apache Jira ticket? (Request account here, not required for trivial changes)
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
• Did you squash your changes to a single commit? (not required, but preferred)
• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?
• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.