Change the naming convention for plugins

[meeech]

Summary

The current proposed naming convention is:

rollouts-my_cool_plugin-<type>-plugin

This requires using the _ - motivated by the need to parse out the plugin name from between the 2 dashes.

Jesse suggested (AR Community meeting: https://youtu.be/wjbGqrVuuDc?t=1299) to use the prefix rollouts-plugin-<type> which will then allow any string to come after and simplify any parsing and discoverability.

eg:
rollouts-plugin-trafficrouter-foo
rollouts-plugin-metric-bar

Proposal: Update docs and the few plugins already created to use this new naming scheme.

todo:

• update docs https://argo-rollouts.readthedocs.io/en/latest/plugins/#plugin-repository, https://argo-rollouts.readthedocs.io/en/latest/analysis/plugins/, https://argoproj.github.io/argo-rollouts/features/traffic-management/plugins/
• example https://github.com/argoproj-labs/rollouts-metric-plugin-sample-prometheus/blob/main/main.go#L4, https://github.com/argoproj-labs/rollouts-metric-plugin-sample-prometheus/blob/main/go.mod#L1 chore: change module name to line up with naming convention argoproj-labs/rollouts-plugin-metric-sample-prometheus#2

reach out to current plugin repos to let them know

• rollouts-contour-trafficrouter-plugin https://github.com/argoproj-labs/rollouts-contour-trafficrouter-plugin Update repo name argoproj-labs/rollouts-plugin-trafficrouter-contour#12
• rollouts-opsmx-metric-plugin https://github.com/argoproj-labs/rollouts-opsmx-metric-plugin Update repo name argoproj-labs/rollouts-opsmx-metric-plugin#3
• rollouts-gatewayapi-trafficrouter-plugin https://github.com/argoproj-labs/rollouts-gatewayapi-trafficrouter-plugin Update repo name argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi#12
• Reach out to other verticals to put this on their radar. eg: it looks like workflows and cd are starting to introduce plugins https://github.com/argoproj-labs?q=plugin&type=all&language=&sort=

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