FindSQLite3: Add SQLite::SQLite3 ALIAS

[traversaro]

🦟 Bug fix

Fixes (or provides a workaround) for #312 .

Summary

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[azeey]

This broke gz-transport11 for me on Ubuntu 20.04 with the error

-- Checking for module 'sqlite3 >= 3.7.13'
--   Found sqlite3 , version 3.31.1
CMake Error at /home/addisu/ws/fortress/install/share/cmake/ignition-cmake2/cmake2/FindSQLite3.cmake:62 (add_library):
  add_library cannot create ALIAS target "SQLite::SQLite3" because target
  "SQLite3::SQLite3" is imported but not globally visible.
Call Stack (most recent call first):
  /home/addisu/ws/fortress/install/share/cmake/ignition-cmake2/cmake2/IgnUtils.cmake:197 (find_package)
  CMakeLists.txt:107 (ign_find_package)


-- Looking for sqlite3 - found

[traversaro]

Thanks for the report. Which CMake version are you using?

[traversaro]

I think the error on my side is that I tested only on gz-cmake3 (where all the targets imported by g-cmake are GLOBAL due to #273) and I did not tested it on ign-cmake2 .

[traversaro]

@azeey hopefully #317 should work fine.