Proto commits in conveyal/r5

These 4 commits are when the Protocol Buffers files have changed:

Commit:7439a03
Author:Andrew Byrd
Committer:Andrew Byrd

build: update to latest protobuf also recompiled geobuf.proto to java code using this version

The documentation is generated from this commit.

Commit:06bc4d3
Author:Andrew Byrd

Bring R5 in line with analysis-backend v6.0.0

Commit:e6f484a
Author:Matthew Wigginton Conway

Revert "feat(transport-network-cache): Build a linked grid pointset when retrieving base network from cache." This reverts commit f4038256833f80452b33d5f8f96e97ea8c915b66.

This commit does not contain any .proto files.

Commit:f403825
Author:Matthew Wigginton Conway

feat(transport-network-cache): Build a linked grid pointset when retrieving base network from cache. This linked grid pointset will not be used directly but will be used as the base linkage when linking a scenario pointset, providing a substantial performance boost.