add persistent id for Redis pconnect() method.

[lanlin]

we'd better have a persistent id for Redis pconnect() method.
cause without it we can't switch between multiple databases at in the same PHP process.
the data will always be saved to the last database without it.
as I know all Phalcon versions have this bug.

• Type: bug fix
• Link to issue: provide a persistent id for redis persistent connection #14334

check this: https://github.com/phpredis/phpredis#pconnect-popen

[Jurigag]

Change branch, we don't accept prs to master branch.

[niden]

Also please target the 4.x branch and update the changelog. After that this is good to go.

[codecov]

Codecov Report

Merging #14335 into 4.0.x will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #14335      +/-   ##
==========================================
+ Coverage    66.3%   66.31%   +<.01%     
==========================================
  Files         488      488              
  Lines      115903   115905       +2     
==========================================
+ Hits        76855    76857       +2     
  Misses      39048    39048

[ruudboon]

Can you update the CHANGELOG-4.0.md also?

[lanlin]

Change branch, we don't accept prs to master branch.
Also please target the 4.x branch and update the changelog. After that this is good to go.
Can you update the CHANGELOG-4.0.md also?

@niden @ruudboon @Jurigag the above changes have been modified. there anything else?

[CameronHall]

@lanlin, you have a lot of commits in your PR that aren't relevant. Can you please only send the relevant commits?

[lanlin]

sorry，i based on a wrong branch, let me create a new pull.