Update the `remote_settings` create subcommand to validate major version bumps

[nordzilla]

Description

In addition to checking that the same record version does not exist (#225), we should also check that the new record version is only the next available version bump, if it is bumped.

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Expectations

When uploading a new major-version bump, we must validate that the minor version is 0.
We must also validate that the previous major version, if it exists, is exactly one less than the new major version.

Examples

Existing Models	New Model	Outcome	Reason
None	2.1	failure	The new major version does not have a minor version of zero.
[1.0, 1.1]	2.1	failure	The new major version does not have a minor version of zero.
[1.0, 1.1]	3.0	failure	The new major version is not exactly one more than the previous major version.
None	2.0	success	The new major version has a minor version of zero.
[1.0, 1.1]	2.0	success	The new major version has a minor version of zero and is exactly one more than the previous major version.