* 🐛 fix(generateCommitMessageFromGitDiff.ts): remove unnecessary separator variable
* 🐛 fix: split file diffs by files
* ✨ feat: add support for generating commit messages by file diffs
* ✨ feat(generateCommitMessageFromGitDiff.ts): add mergeStrings utility function to merge string arrays
* 🐛 fix(generateCommitMessageFromGitDiff.ts): reduce MAX_REQ_TOKENS to 1000
* ✨ feat(generateCommitMessageFromGitDiff.ts): add support for generating commit messages for large diffs by splitting them into smaller chunks and generating commit messages for each chunk using OpenAI's GPT-3 model.
* ♻️ refactor: extract getCommitMsgsPromisesFromFileDiffs function from generateCommitMessage function
* ♻️ refactor: extract getMessagesPromisesByLines function from getCommitMsgsPromisesFromFileDiffs function
* ✨ feat: add support for merging file diffs into one commit message if it exceeds MAX_REQ_TOKENS limit
* ✨ feat(mergeStrings.ts): add mergeStrings function to merge strings in an array based on maxStringLength
di-sukharev