Fix installation of the unversioned shared library symlink

[riken127]

Fixes #331.

The current CMake installation rules install the versioned shared library files:

1. libfunctions_framework_cpp.so.1.3.0
2. libfunctions_framework_cpp.so.1.3

but omit the unversioned development symlink:

1. libfunctions_framework_cpp.so

The installation configuration used separate LIBRARY clauses with NAMELINK_SKIP and NAMELINK_COMPONENT. Consolidating them into a single LIBRARY clause allows CMake to install the versioned library files as part of the runtime component and the unversioned namelink as part of the development component.

Validation

Configured and installed the project with:

cmake -S . -B build \
  -DBUILD_SHARED_LIBS=ON \
  -DBUILD_TESTING=OFF \
  -DCMAKE_INSTALL_PREFIX="$PWD/staging"

cmake --build build
cmake --install build

The complete installation now contains:

libfunctions_framework_cpp.so -> libfunctions_framework_cpp.so.1.3
libfunctions_framework_cpp.so.1.3 -> libfunctions_framework_cpp.so.1.3.0
libfunctions_framework_cpp.so.1.3.0

Component-specific installation was also verified:

runtime:
  libfunctions_framework_cpp.so.1.3
  libfunctions_framework_cpp.so.1.3.0

development:
  libfunctions_framework_cpp.so

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[scotthart]

/gcbrun

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.89%. Comparing base (8baacc8) to head (16e1fb0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #506   +/-   ##
=======================================
  Coverage   85.89%   85.89%           
=======================================
  Files          96       96           
  Lines        2814     2814           
  Branches      203      203           
=======================================
  Hits         2417     2417           
  Misses        282      282           
  Partials      115      115           

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