feat: Add the ability to access ParseConfig as a dictionary

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

Addresses feature ask in #57.

Approach

Add a new type called ParseConfigCodable which is interoperable with any type that conforms to ParseConfig. That means that either can be used to save/fetch the Config either from the Server or from local storage (Memory/Keychain). Below is an example of how to use the new ParseConfigCodable with a type erased AnyCodable values. Note that any Codable type can be used for the value of the Dictionary. The keys will always be strings:

// Fetching Config
let fetched: [String: AnyCodable] = try await ParseConfigCodable.fetch()

for (key, value) in fetched {
  guard let fetchedValue = fetched[key]?.value as? String else {
    print("Could not cast value as String")
    return
  }
  print("Key: \(key), Value: \(value)")
}

// Saving/Updating Config
let key = "welcomeMessage"
let value = "Hello"
var config = [String: AnyCodable]()
config[key] = AnyCodable(value)

let saved = try await ParseConfigCodable.save(config)
print(saved)

// Accessing Config from Keychain
let currentConfig: [String: AnyCodable] = try await ParseConfigCodable.current()
print(currentConfig)

TODOs before merging

• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)

[codecov]

Codecov Report

Merging #68 (26b69e3) into main (11bb8e6) will decrease coverage by 2.84%.
The diff coverage is 99.29%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   90.49%   87.65%   -2.84%     
==========================================
  Files         166      128      -38     
  Lines       14955    12439    -2516     
==========================================
- Hits        13533    10903    -2630     
- Misses       1422     1536     +114     

Impacted Files	Coverage Δ
...urces/ParseSwift/Protocols/ParseConfig+async.swift	100.00% <ø> (ø)
Sources/ParseSwift/Objects/ParseUser.swift	90.34% <91.66%> (-0.44%)	⬇️
...s/ParseSwift/Objects/ParseInstallation+async.swift	92.34% <100.00%> (-0.33%)	⬇️
Sources/ParseSwift/Objects/ParseInstallation.swift	88.05% <100.00%> (-0.26%)	⬇️
Sources/ParseSwift/Objects/ParseUser+async.swift	94.16% <100.00%> (-0.12%)	⬇️
Sources/ParseSwift/Parse.swift	84.02% <100.00%> (-13.97%)	⬇️
Sources/ParseSwift/Protocols/ParseConfig.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Types/ParseACL.swift	93.56% <100.00%> (ø)
...es/ParseSwift/Types/ParseConfigCodable+async.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Types/ParseConfigCodable.swift	100.00% <100.00%> (ø)
... and 1 more

... and 57 files with indirect coverage changes

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