feat: add support for adding new VTuber via GraphQL mutation

[noaione]

As title said, this will admin to add new VTuber to the database.

Schema:

"""
ihateani.me API Mutation
"""
type Mutation {
    """
    Add a VTuber channel to the database
    """
    VTuberAdd(
        "Channel ID"
        id: String!
        "Channel group association"
        group: String!
        "Romanized/English channel name"
        name: String!
        "Platform name"
        platform: PlatformName!
    ): ChannelObject!
}

Admin need to provide a Authorization Header that contains the secure_password value defined in config and prepending password

Example:

{
    "Authorization": "password my_super_secret_password"
}

If the admin doesn't provide it, it will fail.

[codecov[bot]]

Codecov Report

Merging #14 (5f92650) into master (97db9ce) will decrease coverage by 2.10%. The diff coverage is n/a.

:exclamation: Current head 5f92650 differs from pull request most recent head a301fc6. Consider uploading reports for the commit a301fc6 to get more accurate results

@@             Coverage Diff             @@
##            master      #14      +/-   ##
===========================================
- Coverage   100.00%   97.89%   -2.11%     
===========================================
  Files            2        2              
  Lines          163      190      +27     
  Branches        49       50       +1     
===========================================
+ Hits           163      186      +23     
- Misses           0        4       +4     

Flag	Coverage Δ
unittests	97.89% <ø> (-2.11%)	:arrow_down:

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Impacted Files	Coverage Δ
src/utils/swissknife.ts	97.81% <ø> (-2.19%)	:arrow_down:

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