feat(autoware_adapi_v1_msgs): add route following check option

[isamu-takagi]

Description

Add option for route change API. See autowarefoundation/autoware-documentation#602 for details.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

None (only add message field)

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[youtalk]

LGTM

[sasakisasaki]

@isamu-takagi Thank you! Let me ask a question, does the allow_while_using_route have a default value, or all functions which are using this message can handle the merged message?

[isamu-takagi]

@sasakisasaki The default value is false.

[sasakisasaki]

@isamu-takagi Thank you for the answer! Then LGTM 👍