Add TPS7A20 power management subcircuit

[techmannih]

Summary

• add the TPS7A2033PDBVR chip definition and TPS7A20 short-name wrapper
• add a reusable PowerManagement_TPS7A20 3.3 V LDO reference subcircuit
• export the new chip and subcircuit from the package entrypoint
• add the schematic snapshot and document the new exports
• intentionally omit the PCB snapshot

Why

This makes the TPS7A20 typical application available as a reusable component from @tsci/tscircuit.ti.

Impact

Consumers can import either PowerManagement_TPS7A20 or the low-level TPS7A20 chip components directly from the package.

Validation

• bun build index.ts --outdir /tmp/ti-tps7a20-build --target bun — passed
• Biome check for the three new TPS7A20 source files — passed
• git diff --cached --check — passed
• PCB snapshot exclusion check — passed
• bun run typecheck — blocked by the repository's existing TS5097 errors for .tsx import paths
• bun run snapshot — blocked by the installed circuit-json package missing the getRotationBetweenPcbPin1Locations export

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[techmannih]

[tscircuitbot]

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