enabled inline comments with no code suggestions to be shown

Summary:
**Context**: explained by the title

**Solution**:
With code suggestion, we get commit hash from CodePatch so that we can compare code in editor with the commit code. We do this to realigned the line number in case of code change in vscode editor.

For entities without codepatch, we have to fetch the commit hash via 'changeset' in comment's data.  Hence the added graphql.

**PS.** In the next diff I will add in the ability to resolve a comment, so user can resolve and disband comments without codepatch.

Differential Revision: D67951639

fbshipit-source-id: c45be6a747653bab3707e1fde1c117015e3396ea

Author: Jack Huang

addons/isl/src/types.ts

@@ -146,15 +146,14 @@ export type DiffComment = {
   html: string;
   content?: string;
   created: Date;
+  commitHash?: string;
   /** If it's an inline comment, this is the file path with the comment */
   filename?: string;
   /** If it's an inline comment, this is the line it was added */
   line?: number;
   reactions: Array<DiffCommentReaction>;
   /** Suggestion for how to change the code, as a patch */
   suggestedChange?: SuggestedChange;
-  // codePatchSuggestedChange?: SuggestedChange;
-  // signalSuggestedChange?: SuggestedChange;
   replies: Array<DiffComment>;
   /** If this comment has been resolved. true => "resolved", false => "unresolved", null => the comment is not resolvable, don't show any UI for it */
   isResolved?: boolean;