* feat: Added comment for public functions

feat: Add query comments to headers for improved debugging

This feature enhances debugging by including query comments in headers, allowing developers to trace the query's origin. By matching the query comment in the header, it's easier to identify the specific location in the code where the query was executed.

* feat: Fixed query buffer append

* feat: Changed query comment template

* Reverted changes in test

* Revised query comment implementation

* Fixed appendComment func doc

* Kept if cond only inside appendComment

* Implemented tests for appendComment to verify proper escaping of comment symbols

Bumps [golang.org/x/crypto](https://github.com/golang/crypto) from 0.21.0 to 0.31.0.
- [Commits](golang/crypto@v0.21.0...v0.31.0)

---
updated-dependencies:
- dependency-name: golang.org/x/crypto
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Make reader and writer buffers configurable

Replace global sync pools with per-DB pools and make reader and writer buffers configurable.
Default buffer sizes: 1Mb for reader buffer, 64Kb for writer buffer.

Context:
DB connections are pooled, usually there are not much of them available,
so this is a resource used by goroutines, which have to wait for their
turn in order to get a connection and use it before returning it back to
the pool.

Before getting into the waiting line every goroutine allocates a read
and a write buffer from the sync.Pool of buffers.
Currently hardcoded reader buffer size is 1Mb, so when 1000 goroutines
wait in the queue, you get 1000Mb of buffers pre-allocated. So when an
application unexpectedly gets a spike of traffic and all the database
connections are being used, we don't get request timeouts as one could
be expecting, the application is being OOM-killed instead.

The patch addresses this issue by trading some allocations and
(probably, though my benchmarks don't really show it) latency for the
ability to serve more simultaneous connections.

* Fix tests by using properly initialized Conn

Bumps [golang.org/x/crypto](https://github.com/golang/crypto) from 0.21.0 to 0.31.0.
- [Commits](golang/crypto@v0.21.0...v0.31.0)

---
updated-dependencies:
- dependency-name: golang.org/x/crypto
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>