{Build} Pilot Dataset - Promote 1.1.0a2 to the 1.1.0 release

Summary:
Explanation:
`version.txt` moves from the `1.1.0a2` pre-release to the `1.1.0` final release, and the pilot
dataset documentation gains a changelog page.

PEP 440 treats an `aN` suffix as a pre-release, and plain
`pip install projectaria-gen2-pilot-dataset` - the command the README gives - skips
pre-releases. Every version published so far has carried such a suffix, so the documented
install command could not reach any of them. A final version makes the README's instructions
work as written.

The new `dataset/pilot/changelog.mdx` follows the layout of the existing `projectariatools`
changelog. `1.1.0` is described as what it is for users: a compatibility release for
`projectaria-tools` 2.2.0, which also brings Rerun SDK 0.33.0, plus the fix for the
hand-object-interaction masks that the Rerun upgrade broke. Internal-only changes are left out.
The sidebar is autogenerated from the directory, so the page needs only a `sidebar_position`;
it is placed after the tutorials.

Reproducibility:
`version.txt` is the only place the version is declared: `setup.py` reads it through
`_get_version()`, and no other file in the package hardcodes the string.

___

Differential Revision: D116128438

fbshipit-source-id: fb9a706573f0682a1ae3d158bd57fc94d220f7c2

Author: kongchen1992

website/docs-research-tools/dataset/pilot/changelog.mdx

@@ -0,0 +1,29 @@
+---
+sidebar_position: 4
+title: Changelog
+---
+
+# Changelog
+
+Release history for the `projectaria-gen2-pilot-dataset` Python package.
+
+## Version 1.1.0
+
+Compatibility release for `projectaria-tools` 2.2.0.
+
+### Improvements
+
+- Updated to `projectaria-tools` 2.2.0. This raises the minimum supported Python version to 3.10
+- Updated to Rerun SDK 0.33.0
+
+### Bug Fixes
+
+- Fixed hand-object interaction segmentation masks displaying incorrectly in the viewer. The
+  overlay hid the RGB camera image, so any frame carrying masks appeared black with the masks
+  drawn on top of it. This was introduced by the Rerun SDK upgrade
+
+---
+
+## Version 1.0.0
+
+Initial release of the Aria Gen 2 Pilot Dataset loader and visualizer.