[sqlite] implement C++ code to get synced metadata
b0cdf069f964
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Description

[sqlite] implement C++ code to get synced metadata

Summary:
Introduces code necessary for native ops for getting the synced metadata store

Depends on D11418

Test Plan:
Later diffs will utilize this code to read the synced metadata into redux.

As in the previous diff, ran the following code:

async function run_test() {
  console.log('running run_test()');

  await commCoreModule.processSyncedMetadataStoreOperations([
    {
      type: 'remove_all_synced_metadata',
    },
  ]);

  let data = await commCoreModule.getClientDBStore();
  console.log(data.syncedMetadata);

  await commCoreModule.processSyncedMetadataStoreOperations([
    {
      type: 'replace_synced_metadata_entry',
      payload: {
        name: 'test_B_name',
        data: 'test_B_data',
      },
    },
    {
      type: 'replace_synced_metadata_entry',
      payload: {
        name: 'test_A_name',
        data: 'test_A_data',
      },
    },
    {
      type: 'replace_synced_metadata_entry',
      payload: {
        name: 'test_A_name',
        data: 'test_A_update',
      },
    },
    {
      type: 'remove_synced_metadata',
      payload: { names: ['test_B_name'] },
    },
  ]);

  data = await commCoreModule.getClientDBStore();
  console.log(data.syncedMetadata);
}

And received the correct response of [{"data": "test_A_update", "name": "test_A_name"}]