Introduce APP KEY feature of Laravel

[touhidurabir]

Describe the Proposal
Introduce the Laravel like APP KEY feature/behaviour for next release of OJS/OMP/OPS . This will be a required details need to set which will be required at the app bootstrapping .

Additional Information
With the merge of Convert session and cookie management to Laravel, we have the ability to make the cookie encrypted and that feature added . However we have limited chiper support for the cookie encryption because we do not have full featured app key behaviour implemented . By introducing the app key we can have bring in the full encryption support of laravel.

However this will not only have impact for cookie encryption but for any encryption and auth token generation process and we can leverage the native laravel built in functionality for that purpose . Also this does not impact with any hashing functionality e.g. password hashing .

Possible Implementation flow

1. A config option named app_key
2. Command line tool to generate/update app key
3. config option to on/off cookie encryption
4. config option to set cipher settings e.g. aes-128-cbc/aes-256-cbc/aes-128-gcm/aes-256-gcm
5. keeping the app key optional of app bootstrapping process but required for encryption/decryption process .
6. upgrade migration to set the app key in app_key variable present in the config.inc.php file, it will not throw error but log error in missing or failed .

Impacted systems
OJS/OMP/OPS main(3.5.0 pre release)

**PRs **
pkp-lib --> #9918
ojs --> pkp/ojs#4257
omp --> pkp/omp#1575
ops --> pkp/ops#690

[touhidurabir]

@asmecher can you review the PRs at #9895 (comment)

[asmecher]

Reviewed: pkp/ojs#4257 (review)

Once that's ready, please port to the other apps as well.

[touhidurabir]

completed by merging of PRs at #9895 (comment)