Added possibility to exclude symbols from drawing on the map

[vasilevzhivko]

Use case

My map has an XML file containing multiple elements (symbols) that are drawn on the map. In many cases the user wont need 50% of them. Example:

<rule e="any" k="tourism" v="alpine_hut" zoom-min="12">
	<rule e="any" k="name" v="*">
		<rule e="any" k="access" v="~">
                  <rule e="any" k="abandoned" v="~yes|~">
                      <rule e="any" k="winter_room" v="wr_yes">
                          <symbol id="BGM_Hiza" priority="2" display="always" src="assets/map/mapstyles/bgm_res/BGM_Hiza.svg" symbol-scaling="size" symbol-height="20" symbol-width="20" />
                          <caption k="name" priority="2" symbol-id="BGM_Hiza" position="above" font-style="bold" font-size="11" fill="#DD0000" stroke="#E5FFFFFF" stroke-width="2" />
                          <caption k="ele" priority="-5" symbol-id="BGM_Hiza" position="below" font-style="bold" font-size="8" fill="#DD0000" stroke="#E5FFFFFF" stroke-width="2" />
                      </rule>
                      <rule e="any" k="winter_room" v="~">
                          <symbol id="BGM_Hiza" priority="2" display="always" src="assets/map/mapstyles/bgm_res/BGM_Hiza.svg" symbol-scaling="size" symbol-height="20" symbol-width="20" />
                          <caption k="name" priority="2" symbol-id="BGM_Hiza" position="above" font-style="bold" font-size="11" fill="#DD0000" stroke="#E5FFFFFF" stroke-width="2" />
                          <caption k="ele" priority="-5" symbol-id="BGM_Hiza" position="below" font-style="bold" font-size="8" fill="#DD0000" stroke="#E5FFFFFF" stroke-width="2" />
                      </rule>
                  </rule>
		</rule>
	</rule>
</rule>

Thats why I am proposing this PR to add an option to exclude some symbol Ids from drawing on the map.

Usage

  final Set<String> excludedElements = {"BGM_Hiza"};
  final renderTheme = await RenderThemeBuilder.create(
    _displayModel,
    'assets/map/mapstyles/Elevate.xml',
    excludeIds: excludedElements,
  );
  final jobRenderer = MapDataStoreRenderer(
    mapFileLoaded,
    renderTheme,
    _symbolCache,
    true,
  );

The excludedIds is optional.