[Media] Updating AMS extension to 2020 sdk

[hivyas]

Description

Updated AMS extension to use azure-mgmt-media 3.0.

Model AudioAnalyzerPreset has a new parameter mode
Model LiveEvent has a new parameter transcriptions
Model LiveEvent has a new parameter hostname_prefix
Model LiveEvent has a new parameter use_static_hostname
Model MediaService has a new parameter encryption
Model MediaService has a new parameter identity
Model MediaService has a new parameter storage_authentication
Model VideoAnalyzerPreset has a new parameter mode
Model LiveEventEncoding has a new parameter stretch_mode
Model LiveEventEncoding has a new parameter key_frame_interval
Added operation LiveEventsOperations.allocate

Testing Guide

az ams encryption set --name {account-name} -g {rg} --key-source CustomerKey --key-vault-id {key vault id}
History Notes

[AMS] Updated module to use 2020 Azure Media Services api.
[AMS] az ams account encryption: New subgroup to show or set the encryption for the media service account
[AMS] az ams account storage set-authentication: New command to set the authentication for the storage account associated with the media service account
[AMS] az ams account create (mi-system-assigned): New --mi-system-assigned parameter for account create to set the managed identity of the media account
[AMS] az ams account mru set: This command will no longer work for Media Services accounts that are created with the 2020-05-01 version of the API or later.
[AMS] az ams live-event create (stretch-mode, key-frame-interval, transcrip-lang, use-static-hostname, custom hostname): Add new parameter options to live-event create command
[AMS] az ams live-event standby: New command to put the live event in standby mode
[AMS] az ams transform create (videoanalysismode, audioanalysis mode): New parameter options for transform create

Note: --id-system-assigned is renamed --mi-system-assigned in #17074

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[yonzhan]

AMS

[fengzhou-msft]

Please fix style and linter issue based on the ADO log. You can suppress option_too_long check in linter_exclusions.yml.