feat: update github adapter spec (#1306)

* fix: pages is an array so none can be considered the main one

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add PackageEvent

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add SponsorshipEvent

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add BranchProtectionRuleEvent

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add BranchProtectionConfigurationEvent and CustomPropertyEvent

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add more missing events

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* feat: add missing CodeScanningAlertEvent

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* wip

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* fix: dug last remarks

Signed-off-by: Remi Cattiau <remi@cattiau.com>

* fix: should case

Signed-off-by: Remi Cattiau <remi@cattiau.com>

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Signed-off-by: Remi Cattiau <remi@cattiau.com>

Author: loopingz