Enhance STM library readability - 1/2

[jpraynaud]

Why

We want to have more readability of the STM library and make it easier to maintain.

What

Use better namings for types and functions.

How

• Define new names for types:
  • Apply new names for types
  • Add crate exports for these new names
  • Create aliases for previous exports to avoid breaking change
  • Deprecate the previous exports
• Define new names for function names:
  • Create alias for the public functions for backward compatibility
  • Deprecate previous public functions
• Run a backward compatibility check

[curiecrypt]

Let's consider adding the following to the to-do list of this issue:

• Revise error handling -> this item might have its own issue as well
• Revise tests
  • Test names
  • Add if there are any missing tests
  • Check whether existing tests are correct and necessary.
  • Make corrections if needed