Support static libtsfile builds

[ColinLeeo]

Motivation

DuckDB extensions and other self-contained integrations need to link TsFile statically instead of depending on a runtime libtsfile shared library.

Previously, the C++ build always declared libtsfile as a SHARED target, so BUILD_SHARED_LIBS=OFF did not affect it.

Changes

• Add the TSFILE_BUILD_SHARED CMake option.
  • Defaults to ON to preserve the existing behavior.
  • Set it to OFF to generate libtsfile.a or tsfile.lib.
• Add TSFILE_STATIC handling for MSVC symbol visibility.
• Propagate TSFILE_STATIC to consumers linking the CMake tsfile target.
• Skip copying libtsfile.dll for Windows static builds.
• Expose the option through Maven:

  mvn clean verify -P with-cpp -Dtsfile.build.shared=OFF