Consolidate table creation code in tests

[robertsami]

Jira Link: DB-10465
We currently have a lot of tests which perform their own ad-hoc table creation. Rather than having this code (which is often verbose) spread throughout our tests we should have a unified helper that all of our tests can make use of.

For a sampling of places we're doing this:

gg ' CreateTable(.*{'
src/yb/benchmarks/yb_load_test_tool.cc:void CreateTable(const YBTableName &table_name, YBClient* client) {
src/yb/client/ql-tablet-test.cc:  void CreateTable(const YBTableName& table_name, TableHandle* table, int num_tablets = 0) {
src/yb/integration-tests/all_types-itest.cc:  Status CreateTable() {
src/yb/integration-tests/alter_table-test.cc:  Status CreateTable(const YBTableName& table_name) {
src/yb/integration-tests/clock_synchronization-itest.cc:  void CreateTable() {
src/yb/integration-tests/kv_table_ts_failover_write_if-test.cc:  void CreateTable() override {
src/yb/integration-tests/master_failover-itest.cc:  Status CreateTable(const YBTableName& table_name, CreateTableMode mode) {
src/yb/integration-tests/ts_itest-base.h:  void CreateTable() {
src/yb/integration-tests/update_scan_delta_compact-test.cc:  void CreateTable() {
src/yb/yql/cql/ql/test/ql-static-column-test.cc:  void CreateTable(TestQLProcessor *processor) {
src/yb/yql/pgwrapper/pg_wrapper_test_base.h:  void CreateTable(const std::string &statement) {

Let's consolidate and replace these uses where appropriate