feat(ptt): Add space ptt feature to features

[SayyantR]

For PTT, in order to ensure that the default lockfile-less logic (to only generate graphs in the absence of a lockfile) is overridden when a customer is using PTT, we need a way to communicate the status of the PTT feature to the CLI from the app. As such, this PR introduces path_to_transitivity as an optional (for backwards compatibility) boolean value on feature .

An alternative I was exploring was adding a field to the scan_config and scan_response objects which could store a list of "feature flags" and their values/enabled status from the app in order to avoid having to make changes to interfaces in the case that we want feature flag behavior to affect the way semgrep-pro works. However, with this approach, the main con is that we would need to ensure that the names of the feature flags stay consistent between the CLI and the app which would open us up to bad bugs resulting from silly things like typos.

With the approach in this PR (just tacking PTT onto the list of features in the config), the main con is that principally the features entry gets its values from settings stored as part of the config in postgres. In addition, once PTT is GA, this feature flag becomes useless so ideally, we will update lockfileless to generate the graph by default and then remove code which checks the PTT flag and then altogether from interfaces.

• I ran make setup && make to update the generated code after editing a .atd file (TODO: have a CI check)
• I made sure we're still backward compatible with old versions of the CLI.
  For example, the Semgrep backend need to still be able to consume data generated
  by Semgrep 1.17.0.
  See https://atd.readthedocs.io/en/latest/atdgen-tutorial.html#smooth-protocol-upgrades

[github-actions]

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[gautambhat]

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