Adding custom tags to ways and nodes

[AzilAverakot]

When user provides a dictionary that contains the names of custom tags that need to be ingested those tags are added to ways and nodes.

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Codecov Report

Attention: Patch coverage is 12.12121% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 82.50%. Comparing base (c30254c) to head (16cf6d2). Report is 2 commits behind head on master.

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Files	Patch %	Lines
src/graph.jl	10.00%	18 Missing :warning:
src/parse.jl	15.38%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #103 +/- ## ========================================== + Coverage 81.05% 82.50% +1.44% ========================================== Files 15 15 Lines 1151 1183 +32 ========================================== + Hits 933 976 +43 + Misses 218 207 -11 ```

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[AzilAverakot]

The goal of this change is to allow users to add custom tags to the OSM graph.

MM 3rd network file in this agreed format will contain OSM tags together with vicmap tags and custom tags.

In this pr I add functions to add custom tags to the tags dictionary for ways and nodes. This will only be done if the user provides the dictionary filter to specify which custom tags to ingest.

For example, given the following sample file structure:

    {
          "version": "dtp_osm_road_network_transport:2.2",
          "timestamp_osm_base": "2023-12-05T23:27:21.722",
          "elements": [
                  {
                      "id": "OSM&&NODE10000307796",
                      "type": "node",
                      "lon": 145.2680669,
                      "lat": -37.7890839
                  },
                  {
                      "id": "OSM&&NODE10000307797",
                      "type": "node",
                      "lon": 145.2680689,
                      "lat": -37.7891024
                  },
                  {   
                      "dtp_id": "DTP&&WAY123456789"/"OSM&&WAY123456789",
                      "way_id": "OSM&&WAY123456789",
                      "type": "way",
                      "nodes": ["OSM&&NODE10000307796", "OSM&&NODE10000307797", "OSM&&NODE10000307798"],
                      "source_matched_id": "VICMAP_TRANSPORT&&59472156",
                      "tags": {
                          "name": "Ormiston Place",
                          "nodes": ["OSM&&NODE10000307796", "OSM&&NODE10000307797", "OSM&&NODE10000307798"],
                          "source": "nearmap",
                          "highway": "residential",
                          "more fields": "..."
                      },
                      "custom_tags": {
                          "DTP_REG_NAME": "GREATER METRO",
                          "LGA_ABB_NAME": "CASEY",
                          "MEL30_ART": "N", 
                          "more fields": "..."
                      },
                      "vmt_tags": {
                          "ufi": "59472156", 
                          "div_rd": "U", 
                          "road_name": "ORMISTON", 
                          "road_seal": "1",
                          "more fields": "..."
                      }
                  },
            ]
      }

to ingest selected vmt_tags and custom_tags the user needs to provide the following dictionary as the function input:

tags_filter = Dict(
    "custom_tags" => ["DTP_REG_NAME", "LGA_ABB_NAME", "MEL30_ART"],
    "vmt_tags" => ["ufi", "div_rd"]
)