refactor: simplify library management

[wgtmac]

Libraries are consolidated to libiceberg and libiceberg-bundle

[wgtmac]

FTR, current install directory on my MacOS looks like

/tmp/iceberg/
├── lib/
│   ├── libiceberg_vendored_arrow.a
│   ├── libiceberg_vendored_avrocpp.a
│   ├── libiceberg_vendored_nanoarrow.a
│   ├── libiceberg.dylib
│   ├── libiceberg.a
│   ├── libiceberg_bundle.dylib
│   ├── libiceberg_bundle.a
│   └── cmake/
│       └── Iceberg/
│           ├── IcebergConfig.cmake
│           ├── IcebergConfigVersion.cmake
│           ├── IcebergTargets.cmake
│           └── IcebergTargets-debug.cmake
├── include/
│   └── iceberg/
│       ├── arrow_c_data.h
│       ├── avro.h
│       ├── catalog.h
│       ├── demo.h
│       ├── error.h
│       ├── exception.h
│       ├── expected.h
│       ├── location_provider.h
│       ├── schema.h
│       ├── schema_field.h
│       ├── table.h
│       ├── table_identifier.h
│       ├── transaction.h
│       ├── type.h
│       ├── type_fwd.h
│       ├── iceberg_export.h
│       ├── util/
│       │   ├── formattable.h
│       │   └── formatter.h
│       ├── arrow/
│       │   └── demo_arrow.h
│       ├── avro/
│       │   └── demo_avro.h
│       └── iceberg_bundle_export.h
└── share/
    └── doc/
        └── Iceberg/
            ├── LICENSE
            └── NOTICE

[Copilot]

Pull Request Overview

This PR refactors the library management by consolidating the libraries into libiceberg and libiceberg-bundle, and updates the corresponding build instructions.

• Updated the section title in the README from "Build and Install Iceberg Arrow Library" to "Build and Install Iceberg Bundle Library".
• Adjusted the CMake flags: replacing ICEBERG_ARROW with ICEBERG_BUILD_BUNDLE for both vendored and provided Apache Arrow configurations.

Files not reviewed (18)

• CMakeLists.txt: Language not supported
• cmake_modules/IcebergThirdpartyToolchain.cmake: Language not supported
• example/CMakeLists.txt: Language not supported
• example/demo_example.cc: Language not supported
• src/iceberg/CMakeLists.txt: Language not supported
• src/iceberg/IcebergConfig.cmake.in: Language not supported
• src/iceberg/arrow/CMakeLists.txt: Language not supported
• src/iceberg/arrow/demo_arrow.h: Language not supported
• src/iceberg/avro/CMakeLists.txt: Language not supported
• src/iceberg/avro/demo_avro.h: Language not supported
• src/iceberg/demo.cc: Language not supported
• src/iceberg/puffin.h: Language not supported
• src/iceberg/puffin/CMakeLists.txt: Language not supported
• src/iceberg/puffin/demo_puffin.cc: Language not supported
• src/iceberg/puffin/demo_puffin.h: Language not supported
• src/iceberg/util/CMakeLists.txt: Language not supported
• test/CMakeLists.txt: Language not supported
• test/arrow/CMakeLists.txt: Language not supported

[zhjwpku]

LGTM, thanks.

[wgtmac]

Thanks @lidavidm @zhjwpku!

Could you help merge this? @Fokko @Xuanwo

[Fokko]

@wgtmac Sure thing, LGTM!