Api updates (#143)

* ISSUE-344: api doc

* ISSUE-344: update core version

* ISSUE-344: add get subscriber by id route

* ISSUE-344: add docs workflow

* ISSUE-344: install from branch

* ISSUE-344: fix parameter names

* ISSUE-344: refactor

* ISSUE-344: update action version

* ISSUE-344: update configs

* ISSUE-344: add fields in normalizer

* ISSUE-344: fix warning

* ISSUE-344: fix style

* ISSUE-344: core version update

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Co-authored-by: Tatevik <tatevikg1@gmail.com>

ISSUE-344: add get subscriber by id route

Dropped php 7.0 and 7.1, updated package, ignored build errors for ph…

…p8.0 (#133)

* added github workflow(action) for build and test ci tasks

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* updated php_codesniffer dep

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* updated core dep, dropped php7.0 and php7.1

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* removed php7.0 and 7.1 from workflows, added database requirements

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* updated friendsofsymfony/rest-bundle

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* excluded lowest dependencies from builds

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

* ignored build errors in php8.0`

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

[TASK] Rename the configuration directory to config/ (#106)

This brings the project more in line with the default Symfony
project structure.

Tag 4.0.0-alpha1