Adding required infra for Activity.Api integration with APIM

[willvelida]

This pull request introduces significant updates to the infra/apps/activity-api infrastructure code, primarily to integrate the Activity API with Azure API Management (APIM). The changes include the addition of new parameters, resources, modules, and operations to enable APIM functionality for the Activity API.

APIM Integration:

• Added a new parameter apimName to specify the name of the API Management instance used by the Activity API. (infra/apps/activity-api/main.bicep, infra/apps/activity-api/main.dev.bicepparam) [1] [2]
• Introduced a new existing resource apim of type Microsoft.ApiManagement/service to represent the APIM instance. (infra/apps/activity-api/main.bicep)
• Defined a new module activityApiProduct to manage APIM product configurations, linking it to the APIM instance and a product name. (infra/apps/activity-api/main.bicep)

API Operations in APIM:

• Added a new resource activityApimApi to define the Activity API in APIM, including properties like path, displayName, serviceUrl, and subscription requirements. (infra/apps/activity-api/main.bicep)
• Created multiple APIM API operations:
  • activityApiGetAll: A GET operation at / to retrieve all activity summaries.
  • activityApiGetByDate: A GET operation at /{date} to retrieve activity summaries for a specific date, with a template parameter for the date.
  • activityApiHealthCheck: A GET operation at /healthz/liveness for a liveness health check endpoint.