fix: rename DevelopersKnowledge to DeveloperKnowledge

[bshaffer]

• Rename component directory from DevelopersKnowledge to DeveloperKnowledge
• Rename composer package from google/developers-knowledge to google/developer-knowledge
• Rename github repo from googleapis/php-developers-knowledge to googleapis/php-developer-knowledge

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• DeveloperKnowledge/samples/V1/DeveloperKnowledgeClient/batch_get_documents.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_BatchGetDocuments_sync
• DeveloperKnowledge/samples/V1/DeveloperKnowledgeClient/get_document.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_GetDocument_sync
• DeveloperKnowledge/samples/V1/DeveloperKnowledgeClient/search_document_chunks.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_SearchDocumentChunks_sync

You are about to delete 3 region tags.

• DevelopersKnowledge/samples/V1/DeveloperKnowledgeClient/batch_get_documents.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_BatchGetDocuments_sync
• DevelopersKnowledge/samples/V1/DeveloperKnowledgeClient/get_document.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_GetDocument_sync
• DevelopersKnowledge/samples/V1/DeveloperKnowledgeClient/search_document_chunks.php:25, tag developerknowledge_v1_generated_DeveloperKnowledge_SearchDocumentChunks_sync

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[llatif]

LGTM, thank you!