[WIP] Unified naming for statements

[muzarski]

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• I added relevant tests for new features and bug fixes.
• All commits compile, pass static checks and pass test.
• PR description sums up the changes and reasons why they should be introduced.
• I have provided docstrings for the public items that I want to introduce.
• I have adjusted the documentation in ./docs/source/.
• I added appropriate Fixes: annotations to PR description.

[github-actions]

cargo semver-checks detected some API incompatibilities in this PR.
Checked commit: 43703b7

See the following report for details:

cargo semver-checks output

./scripts/semver-checks.sh --baseline-rev 88bc8c18c69f321137929dab151dc13c94dd1560
+ cargo semver-checks -p scylla -p scylla-cql --baseline-rev 88bc8c18c69f321137929dab151dc13c94dd1560
     Cloning 88bc8c18c69f321137929dab151dc13c94dd1560
     Parsing scylla v0.13.0 (current)
      Parsed [  19.807s] (current)
     Parsing scylla v0.13.0 (baseline)
      Parsed [  18.443s] (baseline)
    Checking scylla v0.13.0 -> v0.13.0 (no change)
     Checked [   0.508s] 72 checks; 70 passed, 2 failed, 0 unnecessary

--- failure module_missing: pub module removed or renamed ---

Description:
A publicly-visible module cannot be imported by its prior path. A `pub use` may have been removed, or the module may have been renamed, removed, or made non-public.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.31.0/src/lints/module_missing.ron

Failed in:
  mod scylla::statement::query, previously in file /home/runner/work/scylla-rust-driver/scylla-rust-driver/target/semver-checks/git-88bc8c18c69f321137929dab151dc13c94dd1560/0c26f914767b7fed84ea4e2ae0ed287f3e2b4289/scylla/src/statement/query.rs:1
  mod scylla::query, previously in file /home/runner/work/scylla-rust-driver/scylla-rust-driver/target/semver-checks/git-88bc8c18c69f321137929dab151dc13c94dd1560/0c26f914767b7fed84ea4e2ae0ed287f3e2b4289/scylla/src/statement/query.rs:1

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.31.0/src/lints/struct_missing.ron

Failed in:
  struct scylla::statement::query::Query, previously in file /home/runner/work/scylla-rust-driver/scylla-rust-driver/target/semver-checks/git-88bc8c18c69f321137929dab151dc13c94dd1560/0c26f914767b7fed84ea4e2ae0ed287f3e2b4289/scylla/src/statement/query.rs:13
  struct scylla::query::Query, previously in file /home/runner/work/scylla-rust-driver/scylla-rust-driver/target/semver-checks/git-88bc8c18c69f321137929dab151dc13c94dd1560/0c26f914767b7fed84ea4e2ae0ed287f3e2b4289/scylla/src/statement/query.rs:13
     Summary semver requires new major version: 2 major and 0 minor checks failed
    Finished [  38.806s] scylla
     Parsing scylla-cql v0.2.0 (current)
      Parsed [  10.088s] (current)
     Parsing scylla-cql v0.2.0 (baseline)
      Parsed [  10.221s] (baseline)
    Checking scylla-cql v0.2.0 -> v0.2.0 (no change)
     Checked [   0.258s] 72 checks; 72 passed, 0 unnecessary
    Finished [  20.609s] scylla-cql
make: *** [Makefile:61: semver-rev] Error 1