Feature: handle "local" plugins

[Guts]

Until now, only "remote" plugins were managed. This PR adds ability to copy plugins stored locally.

Typically in a profile.json:

{
  "$schema": "https://raw.githubusercontent.com/Guts/qgis-deployment-cli/main/docs/schemas/profile/qgis_profile.json",
  "name": "basic",
  "author": "QDT Dev Team",
  "email": "qgis@oslandia.com",
  "icon": "images/qgis.ico",
  "splash": "images/splash.png",
  "qgisMinimumVersion": "3.16",
  "qgisMaximumVersion": "3.30",
  "version": "1.0.0",
  "plugins": [
    {
      "name": "Spreadsheet Layers",
      "folder_name": "SpreadsheetLayers",
      "official_repository": true,
      "plugin_id": 766,
      "version": "2.0.0"
    },
    {
      "name": "Custom intra plugin",
      "folder_name": "intra_plugin",
      "official_repository": false,
      "plugin_id": 202303,
      "location": "local",
      "url": "S://QGIS//plugins//intra-plugin.zip"
    }
}

[codecov-commenter]

Codecov Report

Merging #253 (1e64a61) into main (a0b14b8) will decrease coverage by 3.13%.
The diff coverage is 28.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   67.93%   64.81%   -3.13%     
==========================================
  Files          34       35       +1     
  Lines        1887     2032     +145     
  Branches      402      428      +26     
==========================================
+ Hits         1282     1317      +35     
- Misses        497      601     +104     
- Partials      108      114       +6     

Impacted Files	Coverage Δ
..._deployment_toolbelt/profiles/local_git_handler.py	23.07% <23.07%> (ø)
...deployment_toolbelt/jobs/job_plugins_downloader.py	49.64% <23.21%> (-15.92%)	⬇️
...loyment_toolbelt/jobs/job_profiles_synchronizer.py	41.73% <37.50%> (-1.90%)	⬇️
qgis_deployment_toolbelt/plugins/plugin.py	72.72% <53.84%> (-2.09%)	⬇️
qgis_deployment_toolbelt/profiles/__init__.py	100.00% <100.00%> (ø)
...deployment_toolbelt/profiles/remote_git_handler.py	78.87% <100.00%> (ø)

[florentfgrs]

Tested and approved