Implement API models with tests

[devcrocod]

This task involves creating models that represent the various objects within the GitHub API. The models should reflect all the attributes provided by the GitHub API for each object and adhere to the structure of the API's responses.

Additionally, unit tests should be written for each model to ensure its proper functionality and validate that the models correctly mirror the structure of the GitHub API's responses.

• generate models via github openapi
• adapt models
• write unit tests

models:

• Actions add actions models #5
• Activity add Activity models #6
• Apps add Apps models #7
• Billing add Billing model #8
• Branches add Branches models #9
• Checks add Checks models #10
• Codes of conduct add Codes of conduct model #11
• Code Scanning add Code Scanning model #12
• Codespaces add Codespaces models #13
• Collaborators add Collaborators model #14
• Commits add Commits models #15
• Copilot add Copilot model #16
• Dependabot add Dependabot models #17
• Dependency graph add Dependency graph models #18
• Deploy Keys add Deploy Keys model #19
• Deployments add Deployments models #20
• Emojis add Emojis model #21
• Gists add Gists models #22
• Git database add Git database models #23
• Gitignore add Gitignore model #24
• Interactions add Interactions models #25
• Issues add Issues models #26
• Licenses add Licenses model #27
• Markdown add Markdown model #28
• Meta add Meta model #29
• Metrics add Metrics model #30
• Migrations add Migrations models #31
• Organizations add Organizations models #32
• Packages add Packages models #33
• Pages add Pages models #34
• Projects add Projects models #35
• Pulls add Pulls models #36
• Rate Limit add Rate Limit models #37
• Reactions # 38
• releases add releases models #39
• Repositories add Repositories models #40
• Search add Search models #41
• Secret scanning add Secret scanning models #42
• Security advisories add Security advisories models #43
• Teams add Teams models #44
• Users add Users models #45
• Repository webhooks add Repository webhooks models #46