feat: Add PHP support (TabbyML#1243)

* declare tree-sitter-php 0.20.0

* Declare keywords

* update documentation for php

* Update programming-languages.md

* [autofix.ci] apply automated fixes

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Release 0.7.0

aim-downloader@0.7.0
http-api-bindings@0.7.0
juniper-axum@0.7.0
llama-cpp-bindings@0.7.0
tabby@0.7.0
tabby-common@0.7.0
tabby-download@0.7.0
tabby-inference@0.7.0
tabby-scheduler@0.7.0
tabby-webserver@0.7.0

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Release 0.7.0-dev

http-api-bindings@0.7.0-dev
juniper-axum@0.7.0-dev
llama-cpp-bindings@0.7.0-dev
tabby@0.7.0-dev
tabby-common@0.7.0-dev
tabby-download@0.7.0-dev
tabby-inference@0.7.0-dev
tabby-scheduler@0.7.0-dev
tabby-webserver@0.7.0-dev

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Release 0.6.0

http-api-bindings@0.6.0
juniper-axum@0.6.0
llama-cpp-bindings@0.6.0
tabby@0.6.0
tabby-common@0.6.0
tabby-download@0.6.0
tabby-inference@0.6.0
tabby-scheduler@0.6.0
tabby-webserver@0.6.0

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