Add PVDO table and PVTTableSet return type to PVTExperiments

[Copilot]

generate_pvt_tables always generated PVDG but had no equivalent dead oil (PVDO) table, and returned an anonymous NamedTuple making downstream type dispatch impossible.

Changes

• New PVDOTable struct — mirrors PVDGTable with p, Bo, mu_o fields
• New PVTTableSet struct — typed container replacing the NamedTuple return; exported so downstream packages can dispatch on it
• pvdo_table function — always generated like PVDG; uses overall composition for oil systems, liquid composition near dew point for gas systems
• generate_pvt_tables updates — adds n_pvdo kwarg (default: 20), generates PVDO, returns PVTTableSet
• Base.show methods for PVDOTable and PVTTableSet

Usage

tables = generate_pvt_tables(eos, z, T_res)

tables isa PVTTableSet        # true — dispatchable type
tables.pvdo isa PVDOTable     # true — always generated
tables.pvdg isa PVDGTable     # true — always generated
tables.pvto                   # PVTOTable or nothing (oil systems)
tables.pvtg                   # PVTGTable or nothing (gas systems)

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