odb: add support for ground-only inter-chip parasitics

[AcKoucher]

Summary

These changes introduce dbChipRSeg and dbChipCapNode. With this, we'll be about to extract parasitics of the inter-chip boundaries (bumps).

Out first version of 3D RCX won't take bump context into account, so we don't need dbChipCCSeg for now.

Differently from dbRSeg, dbCapNode and dbCCSeg which are lists that resolve by corner index, the new objects being added here are a single value, because we'll only support single corner in our initial 3D parasitics extraction.

Type of Change

• New feature

Impact

None.

Verification

• I have verified that the local build succeeds (./etc/Build.sh).
• I have run the relevant tests and they pass.
• My code follows the repository's formatting guidelines.
• I have included tests to prevent regressions.
• I have signed my commits (DCO).

[gemini-code-assist]

Code Review

This pull request introduces inter-chip parasitics modeling to the ODB database by adding the dbChipCapNode and dbChipRSeg classes, along with their iterators, schema definitions, serialization support, and unit tests. The review feedback focuses on improving robustness and preventing potential crashes. Specifically, it is recommended to add a direct chip_net_ reference to dbChipRSeg to avoid dangling pointer dereferences during destruction, add null checks for chip_net_ during creation of both cap nodes and r-segs, ensure early returns after logging errors in dbChipRSeg::create, and add a null check for the bump instance in dbChipCapNode::getBTerm.

[eder-matheus]

@codex review

[chatgpt-codex-connector]

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