feat: Better suggestions in product edition (UI/UX) + debounce feature

[g123k]

Hi everyone,

In a product edition, we provide some suggestions for categories, labels…
The current implementation triggers a request for every single letter.
To improve this, the app will now show a loader because the results will appear with a delay.

A video of the change: Video.webm

Just in case it's not clear, let's say you write "ABC" : you will see the suggestions for "A", then "B", then "C".
To be less confusing for the user, I have added a ProgressBar which is visible until the correct suggestions are visible (here "C").

Also, in some cases, the request may take a really long time, and in that case, if that's an intermediate case (eg: A or B), it won't be displayed.

Furthermore, I have added a cache, which may require fewer requests to the server.

Clearly, this is just a UI improvement, but we should implement a debounce-like mechanism to minimize the number of requests to the server.

EDIT: The debounce feature is implemented! (@see #4351 (comment))

[github-actions]

You can test this PR on: Android

[g123k]

Good news!
There is now a debounce feature, which may require way fewer requests.

Here is a video: Search2.webm

(The server is really slow tonight)

[codecov-commenter]

Codecov Report

Merging #4351 (fce5291) into develop (a08a2f9) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4351      +/-   ##
===========================================
- Coverage    10.29%   10.24%   -0.05%     
===========================================
  Files          293      293              
  Lines        14757    14826      +69     
===========================================
  Hits          1519     1519              
- Misses       13238    13307      +69     

Files Changed	Coverage Δ
...ges/smooth_app/lib/pages/product/autocomplete.dart	0.00% <0.00%> (ø)
...app/lib/pages/product/simple_input_text_field.dart	0.00% <0.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more