Is there any AWS Transit Gateway Equivalent services in Azure?
Azure docs
Is this similar to Azure Firewall?
Both are offering the same feature service to connect VPC/VNet of their cloud infrastructure and on-premise network site-to-site VPN. It will work as a central place to connect cloud networks and multiple on-premise networks located at different physical location/country using the cloud's own backbone infra.
Using this service customers can connect their various branch office/data center via Azure/AWS's backbone.
AWS Transit Gateway

Azure Virtual WAN

For Azure I'd recommend using a transit vnet topology which is basically a hub and spoke network. There's an Azure blog post on it published by Microsoft.
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