Implement provider-includes

[karniv00l]

Fixes #261

Test example case:

composer.json

{
    "repositories": [
        {"type": "composer", "url": "https://repo.repman.wip"},
        {"packagist": false}
    ],
    "require": {
        "symfony/symfony": "^5.1"
    }
}

1. install will fetch packages using providers-lazy-url

composer install --profile --no-plugins -vvv

2. run sync to create package$hash and provider-latest$hash

symfony console repman:proxy:sync-metadata

3. update / install will create local cache reading from provider-includes

composer update --profile --no-plugins -vvv

...
[49.7MiB/26.05s] Downloading https://repo.repman.wip/p/symfony/symfony%247991ce39135f0c4c78d637af83ef6e12cde788c209ee3a1576f3addc2f29db47.json
[61.0MiB/26.92s] Writing /Users/piotrek/.composer/cache/repo/https---repo.repman.wip/provider-symfony$symfony.json into cache
...

Subsequent install no vendors (composer install --profile --no-plugins -vvv)

...
Installing doctrine/event-manager (1.1.1): Reading /Users/piotrek/.composer/cache/files/doctrine/event-manager/23170e5878c48f072eeb162c16360f0e139163b4.zip from cache
Loading from cache
...

Subsequent update (composer update --profile --no-plugins -vvv)

...
[7.9MiB/0.11s] Downloading https://repo.repman.wip/packages.json
[7.9MiB/0.93s] Writing /Users/piotrek/.composer/cache/repo/https---repo.repman.wip/packages.json into cache
[8.0MiB/0.93s] Updating dependencies (including require-dev)
[8.1MiB/0.94s] Reading /Users/piotrek/.composer/cache/repo/https---repo.repman.wip/p-provider-latest.json from cache
...
[49.7MiB/1.43s] Reading /Users/piotrek/.composer/cache/repo/https---repo.repman.wip/provider-symfony$symfony.json from cache
...

[codecov]

Codecov Report

Merging #281 into master will decrease coverage by 0.03%.
The diff coverage is 97.89%.

@@             Coverage Diff              @@
##             master     #281      +/-   ##
============================================
- Coverage     99.71%   99.68%   -0.04%     
- Complexity     1793     1818      +25     
============================================
  Files           284      284              
  Lines          5239     5325      +86     
============================================
+ Hits           5224     5308      +84     
- Misses           15       17       +2     

Impacted Files	Coverage Δ	Complexity Δ
src/Service/Proxy.php	96.24% <96.72%> (+0.03%)	56.00 <24.00> (+22.00)
src/Command/ProxySyncMetadataCommand.php	100.00% <100.00%> (ø)	4.00 <0.00> (ø)
src/Controller/ProxyController.php	100.00% <100.00%> (ø)	12.00 <3.00> (+3.00)

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