feat: Add explicit transactions; API cleanups

[rlch]

• feat: Init commit
• fix: Fix lint
• fix: Improve layout
• fix: WIP
• feat: Support explicit transactions
• fix: Remove explicit transaction test case
• fix: Cleanup issues

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 65.90909% with 165 lines in your changes missing coverage. Please review.

Project coverage is 77.82%. Comparing base (b8b5a25) to head (b58b278).

:exclamation: Current head b58b278 differs from pull request most recent head f451ef4

Please upload reports for the commit f451ef4 to get more accurate results.

Files	Patch %	Lines
expr/types.go	69.92%	68 Missing :warning:
client_impl.go	71.84%	34 Missing and 6 partials :warning:
driver.go	15.16%	28 Missing :warning:
internal/scope.go	33.34%	24 Missing and 2 partials :warning:
internal/cypher.go	80.00%	1 Missing and 1 partial :warning:
internal/path.go	85.72%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12 +/- ## ========================================== - Coverage 80.16% 77.82% -2.33% ========================================== Files 20 21 +1 Lines 2469 2786 +317 ========================================== + Hits 1979 2168 +189 - Misses 389 515 +126 - Partials 101 103 +2 ```

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