Add I/O and formatting performance benchmarks

- Add format vs fmt benchmark (format_vs_fmt.cc)
- Add teju vs dragonbox floating point benchmark (teju_vs_dragonbox.cc)
- Add file I/O vs stdio benchmark (file_vs_stdio.cc)

These benchmarks compare fast_io performance against fmt library,
dragonbox/teju floating point implementations, and standard stdio
for various I/O and formatting operations.

Author: puji4810

benchmark/0019.formatting/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.22)
+project(benchmark_formatting CXX)
+
+include(FetchContent)
+
+# Fetch fmt library
+FetchContent_Declare(
+  fmt
+  GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+  GIT_TAG        10.2.1
+)
+FetchContent_MakeAvailable(fmt)
+
+add_executable(benchmark.0019.formatting.format_vs_fmt ${CMAKE_CURRENT_LIST_DIR}/format_vs_fmt.cc)
+target_include_directories(benchmark.0019.formatting.format_vs_fmt PRIVATE ${CMAKE_SOURCE_DIR}/include)
+target_compile_features(benchmark.0019.formatting.format_vs_fmt PRIVATE cxx_std_20)
+target_link_libraries(benchmark.0019.formatting.format_vs_fmt PRIVATE fmt::fmt)