[FR] Display explore label name instead of explore_id

[tomoyamizuno-looker]

Currently in Explore selection dropdown, it displays explore_id value, which come from explore_id column in sample table.

                        {explores.map((oneExplore) => (
                          <MenuItem
                            key={oneExplore.exploreKey}
                            value={oneExplore.exploreKey}
                          >
                            {toCamelCase(oneExplore.exploreId)}
                          </MenuItem>

Here it's great to have a explore label name defined in LookML instead of Camel Case of explore Id, as usually we are setting label name with local language for easy understanding.