Replace Parse Server custom config logic with library

[mtrezza]

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Issue Description

The custom developed logic to handle the Parse Server config options is complex and difficult to maintain. In context of adopting TypeScript https://github.com/parse-community/parse-server/issues/7334, it would require an enormous effort to rewrite the logic. It is also buggy when it comes to complex option types (array of ...).

The are off-the-shelf libs like convict, which include all of the features that we currently maintain by hand.

Suggested Solution

Replace custom config logic with a library.

Requirements:

• validation
• accept options via env var
• accept options via config file
• allow to set dynamic vars, i.e. a function instead of a var, see https://github.com/parse-community/parse-server/issues/9052
• TS support
• config versioning (optional)

This would close:

• https://github.com/parse-community/parse-server/issues/8202
• https://github.com/parse-community/parse-server/issues/8673
• https://github.com/parse-community/parse-server/issues/8432
• https://github.com/parse-community/parse-server/issues/8300
• https://github.com/parse-community/parse-server/issues/7939
• https://github.com/parse-community/parse-server/issues/7151
• https://github.com/parse-community/parse-server/issues/9125

Related:

• https://github.com/parse-community/parse-server/issues/7069