arrow

ARROW-11340: [C++] Add vcpkg.json manifest to cpp project root

@kszucs could you review this please? My main purpose in adding this is to improve the experience for Arrow C++ devs using Windows, but I noticed it also relates to your [TODO in #9096](https://github.com/apache/arrow/pull/9096/files#diff-990134cce6657dbbcf95457cf1a56810a7efa1f6cd58ecc27557c7d6ff45b533R67-R68). vcpkg does not have any `requirements.txt`-style package enumeration mechanism, but it supports this JSON manifest as a mechanism of defining dependencies.

In the `vcpkg install` command, you can specify the path to the directory containing this manifest file with `--x-manifest-root` which later will change to `--manifest-root`. See details at https://vcpkg.readthedocs.io/en/stable/specifications/manifests/.

There are some differences between the packages listed in this manifest versus the packages you listed in the `vcpkg install` commands in #9096
- This installs `gtest` and `benchmark`
- This installs `boost` instead of separate `boost-filesystem`, `boost-regex`, etc.
- This does not explicitly include the `core` feature of `aws-sdk-cpp` because explicitly including it causes an error, and it gets installed anyway

Closes #9287 from ianmcook/ARROW-11340

Lead-authored-by: Ian Cook <ianmcook@gmail.com>
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>