Add suffix support for Notifications

Summary:
# Context

We are introducing EdenFS notifications to support scalable and ergonomic file system notifications for EdenFS mounts.

# This Diff

This diff introduces the concepts of included/excluded Suffixes to the getChangesV2 pipeline.

The files returned from the API will always match any defined included suffixes, and never have any excluded suffixes. If a suffix is both included and excluded, then it is excluded.

A suffix is defined as the substring that ends the string. As currently defined, a suffix could include content past the file extention, including the , eg for file.ext1.ext2, ex2, ext1.ext2, and file.ext1.ext2 are valid suffixes

# Technical Details
This diff creates the thrift definitions for the included/excluded suffix types

# Discussion Points

Reviewed By: jdelliot

Differential Revision: D67613986

fbshipit-source-id: f18957a490d3095324d46046f57233bba92565aa

eden/fs/service/eden.thrift

@@ -1941,13 +1941,23 @@ struct ChangesSinceV2Result {
  * excludedRoots - optional ist of roots to exclude from results. If not
  *   provided or an empty list, no roots will be excluded from results.
  *   Applied after roots are included - see includedRoots.
+ *
+ * includedSuffixes - optional list of suffixes to include in results. If not
+ *   provided or an empty list, all suffixes will be included in results.
+ *   Applied before suffixes are excluded - see excludedSuffixes.
+ *
+ * excludedSuffixes - optional ist of suffixes to exclude from results. If not
+ *   provided or an empty list, no suffixes will be excluded from results.
+ *   Applied after suffixes are included - see includedSuffixes.
  */
 struct ChangesSinceV2Params {
   1: PathString mountPoint;
   2: JournalPosition fromPosition;
   3: optional bool includeVCSRoots;
   4: optional list<PathString> includedRoots;
   5: optional list<PathString> excludedRoots;
+  6: optional list<string> includedSuffixes;
+  7: optional list<string> excludedSuffixes;
 }
 
 service EdenService extends fb303_core.BaseService {