Fix #1479 more verbose pdo driver missing errors for 4.1.x

[Ultimater]

Hello!

• Type: bug fix
• Link to issue: [IDEA] ERROR: could not find driver - Should be more explained #1479

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR

Small description of change:

If using a PDO driver such as Postgresql or Mysql, and it is not loaded when trying to go through the Phalcon adapter, PDO will error with the vague "could not find driver" which will leave developers on a quest to figure out what happened.
This PR will fix the vague issue for 4.1.x and it will instead show a much more detailed error.

Thanks

[codecov]

Codecov Report

Merging #1511 (90db673) into 4.1.x (3df8268) will increase coverage by 0.12%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           4.1.x   #1511      +/-   ##
========================================
+ Coverage   3.15%   3.27%   +0.12%     
========================================
  Files        111     112       +1     
  Lines       5101    5122      +21     
========================================
+ Hits         161     168       +7     
- Misses      4940    4954      +14