WS-507: More foundation-laying for ingestion manifest builder

• Fleshed out classes
• Added example files
• Got started on first test

stole lots from the archive version

apps/cli/executables/pexable/ingest_envoy/ingest_envoy/classes.py

-""" Objects pertaining to the various ingestion manifests """
-
-from enum import Enum
-
-
-class Telescope(Enum):
-    """Codifying the names of our telescopes, because Janet can't abide magic strings"""
-
-    VLA = 1
-    EVLA = 2
-    ALMA = 3
-    VLBA = 4
-    GBT = 5
-    NONE = 6
-
-
-class IngestionType(Enum):
-    """Types of ingestion we'll have to do"""
-
-    # ALMA products
-    ALMA_SDM = Telescope.ALMA
-    ALMA_CAL = Telescope.ALMA
-    ALMA_AUDI = Telescope.ALMA
-
-    # EVLA products
-    EVLA_SDM = Telescope.EVLA
-    EVLA_BDF = Telescope.EVLA
-    EVLA_CAL = Telescope.EVLA
-
-    # RealFast projects
-    REALFAST_SDM = Telescope.EVLA
-
-    # VLASS projects
-    VLASS_QUICKLOOK = Telescope.EVLA
-
-    # VLBA ingestion. (IDI and UVFITS products are treated the same.)
-    VLBA_FITS = Telescope.VLBA
-
-    # Coming Real Soon Now: VLBA Mark 4 product ingestion
-    VLBA_MARK4 = Telescope.VLBA
-
-    # Also coming Real Soon: GBT execution block ingestion
-    GBT_EB = Telescope.GBT
-
-    # Hot on its heels: LVLA execution block ingestion
-    LVLA_EB = Telescope.VLA
-
-    # When we just don't know what we're dealing with
-    UNKNOWN = Telescope.NONE