feat: allow to amend Atmosphere configuration

[cromoteca]

This PR allow users to create a custom connect-client.js file and pass an optional object containing any of the Atmosphere.Request configuration parameters.

Related to #1830.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66e6de1) 95.31% compared to head (f0b9dcc) 95.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1959   +/-   ##
=======================================
  Coverage   95.31%   95.31%           
=======================================
  Files          52       52           
  Lines        3479     3482    +3     
  Branches      522      524    +2     
=======================================
+ Hits         3316     3319    +3     
  Misses        129      129           
  Partials       34       34           

Flag	Coverage Δ
unittests	95.31% <100.00%> (+<0.01%)	⬆️

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[sonarcloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

1 New issue
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[vaadin-bot]

Hi @cromoteca and @cromoteca, when i performed cherry-pick to this commit to 1.4, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 71cff2a
error: could not apply 71cff2a... feat: allow to amend Atmosphere configuration (#1959)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @cromoteca and @cromoteca, when i performed cherry-pick to this commit to 1.3, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 71cff2a
error: could not apply 71cff2a... feat: allow to amend Atmosphere configuration (#1959)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

This ticket/PR has been released with Hilla 24.4.0.alpha3 and is also targeting the upcoming stable 24.4.0 version.