Contrib: Reducing package size (#188)

* HttpAsyncClient: added git config to reduce package size.
* IO: added git config to reduce package size.
* Laravel: removed docker-compose.yml from .gitattributes as it does not exist in this package.
* MongoDB: added git config to reduce package size.
* PDO: added git config to reduce package size.
* Psr3: added git config to reduce package size.
* Psr15: added git config to reduce package size.
* Psr18: added git config to reduce package size.
* Slim: added git config to reduce package size.
* Symfony: added git config to reduce package size.
* Wordpress: added git config to reduce package size.
* Logs/Monolog: added git config to reduce package size.
* AutoInstrumentationInstaller: added git config to reduce package size.
* Aws: added git config to reduce package size.
* Context/Swoole: added git config to reduce package size.
* Propagation/TraceResponse: added git config to reduce package size.
* ResourceDetectors/Container: added git config to reduce package size.
* Shims/OpenTracing: added git config to reduce package size.
* Symfony SDK Bundle: added git config to reduce package size.

Author: ChrisLightfootWild

.gitattributes

@@ -6,7 +6,6 @@
 /.gitattributes export-ignore
 /.gitignore export-ignore
 /.php-cs-fixer.php export-ignore
-/docker-compose.yml export-ignore
 /phpstan.neon.dist export-ignore
 /phpunit.xml.dist export-ignore
 /psalm.xml.dist export-ignore