AWS OpenSearch Provider BugFix

[mgiannoni]

Description
Bug fix update for AWS OpenSearch Provider:

pygeoapi-config.yml parameter for AWS Role

Some typos for class method references

Steps to Reproduce
Deployment using OpenSearch provider using AWS SigV4 Token authenticating with IAM Role.

Expected behavior

OpenSearch access denied

ERROR: "os_search" not found

Environment

• OS: Linux
• Python version: 3.11
• pygeoapi version: 0.22

Additional context

• Docker Container deployment
• AWS SigV4 Token Authentication
• AWS EC2 Container Host using Instance Profile
• Role Name Parameter: provider_def.get("aws_role")