Warn developers when two cmd params of the same type are inserted

[azriel91]

Since Resources is a type map, when a cmd param (workspace_param, profile_param, flow_param) is inserted, params of the same type will overwrite a previous entry. This may or may not be desired, so warning every time is noise.

Desired overwrites:

• Saved params overwritten by newly provided params
• Profile / Flow param being more specific than Workspace param.

Undesired overwrites:

• Profile / Flow param using the same type as a Workspace param.

Maybe there is no software solution.

Found during writing tests that assert on workspace params / flow params insertion.

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Current insertions are in CmdCtxBuilder::*_params_insert. Search for resources.insert_raw.

This may also apply to peace_code_gen::cmd::impl_build.