added mysql test container dependencies

TestContainers.scala: created container definition as part of the mysql
project.  We may want to move and merge this file with postgresql
version in a common location.

shop_schema.sql: called by TestContainer to bootstrap test data in
docker instance.

Created mysql environment heavily insipred (copy/pasted) by the postgres
module.

MysqlModule.scala: performs the conversion of zio-sql functions into
mysql compatible sql.  Currently a copy/paste & rename of the postgres
module.

FunctionDefSpec.scala: module for testing mysql functions (lower, sin,
etc.)

MysqlModuleTest.scala: runs mysql tests, table selects, limits, offset,
etc.

MysqlRunnableSpec.scala:

ShopSchema.scala: defines schema (loaded in test container definition)

GroupByHavingSpec: reformatted in order to fix sbt check failure

MysqlModule: added stubs for new renderUpdate/renderDelete methods that
have been added to Jdbc.

MysqlRunnableSpec: added DeleteExecutor to the jdbcTestEnvironment