Add river routing module for offline (GEOSldas) simulations #1997

Job	Run time
spack_build / Spack Build (ESMF stable)	34m 6s
build_gcm (ifort, Debug) / setup	4s
build_gcm (gfortran-15, Debug) / setup	3s
build_gcm (gfortran-14, Debug) / setup	3s
build_gcm (gfortran-15, Debug) / Build GEOS-ESM/GEOSgcm (gfortran-15)	33m 18s
build_gcm (gfortran-14, Debug) / Build GEOS-ESM/GEOSgcm (gfortran-14)	32m 8s
build_gcm (ifort, Debug) / Build GEOS-ESM/GEOSgcm (ifort)	20m 48s
	2h 0m 30s

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