The initial connection creation method invocations were re-written to
reduce convention by adding an explicit registration mapping between
adapter name and class.

This implements two.
- adapter: oracle_enhanced
  This is the primary one that people will use.
- adapter: oracle
  This replaces the previous emulate_oracle_adapter database config
setting which we can no longer use, since the config is not available
when we are registering this adapter name to class mapping, but
accomplishes the same end. So if you have 'emulate_oracle_adapter: true`
in your configs, remove that, and set your `adapter: oracle`.

rails/rails@009c7e7

rails/rails@a918394#diff-24a7d36a036f13aeb76c81860137f648826a5f5198b8c050f41c8bd6b37eb4b2

This makes the quote_column_name and quote_table_names methods organized
more similarly to how they are the new mysql and postgres adapters.

Explain now returns an object. We need to coerce it into a string for rspec comparisons.

https://blog.saeloun.com/2024/11/21/rails-7-2-adds-support-for-explain-method-to-activerecord-relation/

rails/rails@c1ea574

Introduce a new `bind_block` method. Mimicking this change in the
postgres adapter: rails/rails@2b35775

Provides the expected :aN formatted bind parameter values needed by
oci8.

Thanks to dlaggero for this.
rsim#2424 (comment)

These are not supported by Rails 7.2

First test failure involves a missing method `transform_query`

Seems to have been removed in this rails commit:
fd24e5bfc9540fc00764a59ddf39a993bbd63ba2
rails/rails@fd24e5b

This method was replaced with `preprocess_query`.

@instrumenter is not defined. It was moved to a method.

rails/rails@dc522a3

- Add `write_query?` implementation (mimicking postgres) to support the ability to prevent writes to a database - rails/rails@f39d72d

- Replace the local implementation of execute, exec_query and its alias internal_exec_query with the new interface defined here rails/rails@fd24e5b#diff-e6fd03cad5e3437c76b6c5db106359124dc9feab8341ade39b9ae54af001fac9 of `raw_execute`, `cast_result`, and `affected_rows`. To support the affected_rows count this also had to add a `row_count` method to the coi and jdbc cursors.

- without_prepared_statement? was removed rails/rails@2306c10

drop 3.1
add 3.4