Add eggtimer. (#4557)

* Add eggtimer.

* Add generated changelog entries

.palantir/autorelease.yml

@@ -0,0 +1,6 @@
+type: local
+local:
+  releaseStrategy:
+    type: timeBasedRelease
+    timeBasedRelease:
+      timeSinceLastRelease: 1 days

changelog/@unreleased/pr-4557.v2.yml

@@ -0,0 +1,28 @@
+type: improvement
+improvement:
+  description: |-
+    Add eggtimer.
+
+    **Goals (and why)**:
+
+    Make sure releases happen often.
+
+    **Implementation Description (bullets)**:
+
+    I don't know if this will actually work.
+
+    **Testing (What was existing testing like?  What have you done to improve it?)**:
+
+    **Concerns (what feedback would you like?)**:
+
+    **Where should we start reviewing?**:
+
+    **Priority (whenever / two weeks / yesterday)**:
+
+    <!---
+    Please remember to:
+    - Add any necessary release notes (including breaking changes)
+    - Make sure the documentation is up to date for your change
+    --->
+  links:
+  - https://github.com/palantir/atlasdb/pull/4557