Nikolay TretyakandGitHub 87ea6512d4 pgx support (#4913) ...

<!-- Describe what has changed in this PR -->
**What changed?**
`Driver` interface (with two implementations) was added to the
postgresql persistence package in order to support other drivers than
`lib/pq`. Fixes https://github.com/temporalio/temporal/issues/1775

Essentially, this PR does
https://github.com/temporalio/temporal/pull/4914 in a
backward-compatible and extendable way

<!-- Tell your future self why have you made these changes -->
**Why?**
Since `lib/pq` does not support multi-node clusters


<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
**How did you test it?**
Existing tests


<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
**Potential risks**
No, since you should explicitly change the driver in your config file.
However, `connectAttributes` depend on the driver (e.g.,
`binary_parameters` is supported only by `lib/pq` and is not a part of
postresql standard), so one should be careful changing drivers in
production.


<!-- Is this PR a hotfix candidate or require that a notification be
sent to the broader community? (Yes/No) -->
**Is hotfix candidate?**
No

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..

interface.go

pgx support (#4913)

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pgx.go

pgx support (#4913)

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pq.go

pgx support (#4913)

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