GH-45195: [C++] Update bundled AWS SDK for C++ to 1.11.587 (#45306)

### Rationale for this change

The current bundled version 1.10.55 was released on 2023-01-20:
https://github.com/aws/aws-sdk-cpp/releases/tag/1.10.55

### What changes are included in this PR?

* Use the latest AWS SDK for C++
* Migrate to FetchContent from ExternalProject 

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #45195

Authored-by: Sutou Kouhei <[email protected]>
Signed-off-by: Sutou Kouhei <[email protected]>

Author: kou

ci/rtools/README.md

@@ -56,6 +56,11 @@ cmake_policy(SET CMP0068 NEW)
 # find_package() uses <PackageName>_ROOT variables.
 cmake_policy(SET CMP0074 NEW)
 
+# https://cmake.org/cmake/help/latest/policy/CMP0077.html
+#
+# option() honors normal variables.
+cmake_policy(SET CMP0077 NEW)
+
 # https://cmake.org/cmake/help/latest/policy/CMP0091.html
 #
 # MSVC runtime library flags are selected by an abstraction.
@@ -387,14 +392,10 @@ endif()
 
 # where to put generated archives (.a files)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
-set(ARCHIVE_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
-
 # where to put generated libraries (.so files)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
-set(LIBRARY_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
-
 # where to put generated binaries
-set(EXECUTABLE_OUTPUT_PATH "${BUILD_OUTPUT_ROOT_DIRECTORY}")
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
 
 if(CMAKE_GENERATOR STREQUAL Xcode)
   # Xcode projects support multi-configuration builds.  This forces a single output directory