fvm: Add package

[Kiri2002]

tested in extra-x86_64-build, this is namcap log:

cat fvm-3.0.13-2-x86_64.pkg.tar.zst-namcap.log                                                                                                        03/27/2024 09:51:49 PM PM
fvm E: ELF file ('usr/share/fvm/src/dart') outside of a valid path.
fvm E: ELF file ('usr/share/fvm/src/fvm.snapshot') outside of a valid path.
fvm W: ELF file ('usr/share/fvm/src/fvm.snapshot') lacks FULL RELRO, check LDFLAGS.
fvm W: ELF file ('usr/share/fvm/src/fvm.snapshot') is unstripped.
fvm W: ELF file ('usr/share/fvm/src/fvm.snapshot') lacks PIE.
fvm W: ELF file ('usr/share/fvm/src/dart') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
fvm W: ELF file ('usr/share/fvm/src/fvm.snapshot') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
fvm W: Unused shared library '/usr/lib/libdl.so.2' by file ('usr/share/fvm/src/dart')
fvm W: Unused shared library '/usr/lib/libpthread.so.0' by file ('usr/share/fvm/src/dart')
fvm W: Dependency included, but may not be needed ('git')
fvm W: Dependency included, but may not be needed ('zip')
fvm W: Dependency included, but may not be needed ('unzip')
fvm W: Dependency included, but may not be needed ('xz')
fvm W: Dependency included, but may not be needed ('curl')
fvm W: Dependency included, but may not be needed ('file')
fvm W: Dependency included, but may not be needed ('mesa')

The "may not be needed" packages is same as aur and I think may should be included, since this package using various way to get and build flutter.