Fold the core tnpoint type port (#150)

Brings the temporal network point (tnpoint) type into the accumulate:
construction, text/EWKT/MFJSON I/O, casts, and accessors, registered in
LoadInternal after the tcbuffer surface. The network model resolves route
geometries from a ways CSV; MEOS hardcodes its path
(/usr/local/share/ways1000.csv) with no setter, so the canonical ways1000.csv
is embedded (ways_csv.inc) and materialized there on load (best-effort).

Fixes applied on top of the #150 branch:
- getValue/startValue/endValue value executors renamed to tnpoint-unique names
  (Tnpoint_{get,start,end}_value). Generic names (Tinstant_value /
  Temporal_start_value / Temporal_end_value) are also defined at namespace
  scope in the other geo .cpp — an ODR violation that would otherwise dispatch
  these to the surviving (geometry) definition and render the npoint as a
  geometry ("Unknown geometry type: 0").
- Refresh the asEWKT test expecteds with the ways-network SRID prefix
  (SRID=5676;), matching MobilityDB's asEWKT(npoint) reference; asText omits it.

Full sqllogictest suite green: 1799 assertions across 78 test cases.

(cherry picked from commit 94e01ad)
(cherry picked from commit a0c2f9e)

Author: estebanzimanyi

CMakeLists.txt

@@ -108,6 +108,14 @@ if(CBUFFER)
     src/geo/tcbuffer_in_out.cpp)
 endif()
 
+option(NPOINT "Build the tnpoint temporal type" ON)
+if(NPOINT)
+  add_definitions(-DNPOINT=1)
+  list(APPEND EXTENSION_SOURCES
+    src/geo/tnpoint.cpp
+    src/geo/tnpoint_in_out.cpp)
+endif()
+
 build_static_extension(${TARGET_NAME} ${EXTENSION_SOURCES})
 build_loadable_extension(${TARGET_NAME} "" ${EXTENSION_SOURCES})