* 🚀 feat(generateCommitMessageFromGitDiff.ts): add mergeStrings utility function

* 🐛 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

src/utils/mergeStrings.ts

@@ -0,0 +1,14 @@
+export function mergeStrings(arr: string[], maxStringLength: number): string[] {
+  const mergedArr: string[] = [];
+  let currentItem: string = arr[0];
+  for (const item of arr.slice(1)) {
+    if (currentItem.length + item.length <= maxStringLength) {
+      currentItem += item;
+    } else {
+      mergedArr.push(currentItem);
+      currentItem = item;
+    }
+  }
+  mergedArr.push(currentItem);
+  return mergedArr;
+}