[AU][Admin API] MetaData update configurations

[charithadeshapriya]

Description: The following new configuration has been added to the open-banking.xml as a part of the Admin API metadata update implementation. <AU> <MetaDataCache>

           `<MetadataMgtEndpoint>https://IAM_HOSTNAME:9446/api/openbanking/au-metadata-mgt/au100/register/metadata</MetadataMgtEndpoint>`
    `</MetaDataCache>`

</AU>

OB-AM deployment.toml file contains the following config [open_banking.au.metadata_cache] metadata_mgt_endpoint = "https://IAM_HOSTNAME:9446/api/openbanking/au-metadata-mgt/au100/register/metadata"

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[isharailanga]

Added config to the following pages:

• https://docs.wso2.com/display/OB200/Configuring+Open+Banking+API+Management+for+Australia
• https://docs.wso2.com/display/OB200/Deploying+Consumer+Data+Standards+Administration+API+v1.2.0