add extensions to DbContextOptionsBuilder<TContext>

[alexandre-machado]

In some scenarios, we need to write this:

            var dbContextOptions = new DbContextOptionsBuilder<CoreDbContext>()
                .UseMySql(_connection);
            dbContextOptions.UseSecondLevelCache();

            _options = dbContextOptions.Options;

instead this:

            _options = new DbContextOptionsBuilder<CoreDbContext>()
                .UseMySql(_connection)
                .UseSecondLevelCache().Options;

because we need the DbContextOptions<TDbContext> and it is not possible

or in custom DbContextOptions creation:

        private static DbContextOptions BuildContextOptions(IResolver resolver, string connectionName)
        {
            var optionsBuilder = new DbContextOptionsBuilder<CoreDbContext>();
            var connectionString = resolver.Resolve<IAppConfig>().GetConnectionString(connectionName);
            optionsBuilder
                .UseMySql(connectionString)
                .UseSecondLevelCache();
            return optionsBuilder.Options;
        }

[alexandre-machado]

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