feat(NODE-6865): deprecate transaction getters

[durran]

Description

Deprecates transaction getters that are used internally.

What is changing?

Is there new documentation needed for these changes?

None

What is the motivation for this change?

NODE-6865

Release Highlight

Transaction state getters are deprecated.

These were for internal use only.

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[baileympearson]

Everything in the transaction class, except for the options, is internal.

1. should options be internal too? Why do we need to expose this to users?
2. should the whole class be internal?

[durran]

Everything in the transaction class, except for the options, is internal.

1. should options be internal too?  Why do we need to expose this to users?

2. should the whole class be internal?

I've made the options internal as well but left the class public as making it internal was breaking the community types.