Proto commits in romange/gaia

These 29 commits are when the Protocol Buffers files have changed:

Commit:c32c165
Author:Ori Brostovski
Committer:Ori Brostovski

PIPELINE: Add a README.md for Gaia-MR, delete some unused proto.

The documentation is generated from this commit.

Commit:613b281
Author:Ori Brostovski

PIPELINE: Add a README.md for Gaia-MR, delete some unused proto.

The documentation is generated from this commit.

Commit:98a2be0
Author:Roman Gershman

MR: Extend metadata to int64 type

Commit:1a2a335
Author:Roman Gershman

MR:Propagate the type name of pb type into pb::Output

Commit:4d39b56
Author:Roman Gershman

Simplify table_impl

Commit:07b1e5c
Author:Roman Gershman

Add ZSTD compression support

Commit:dfa82c6
Author:Roman Gershman

MR: First step on supporting multi-file shards

Commit:95bb18a
Author:Roman Gershman

GSOD group by

Commit:db254a6
Author:Roman Gershman

MR:.

Commit:ac80052
Author:Roman Gershman

MR: More preparation work for join operator

Commit:7d207c9
Author:Roman Gershman

.

Commit:4859b13
Author:Roman Gershman

Improve Mapper type support

Commit:f2633f5
Author:Roman Gershman

Support json parsing

Commit:981dc5b
Author:Roman Gershman

.

Commit:ff34e17
Author:Roman Gershman

Allow compressed output

Commit:2afaa19
Author:Roman Gershman

.

Commit:a437f2c
Author:Roman Gershman

.

Commit:3ea95a4
Author:Roman Gershman

.

Commit:8673070
Author:Roman Gershman

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Commit:4b6490f
Author:Roman Gershman

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Commit:1afa269
Author:Roman Gershman

.

Commit:25c3e1e
Author:Roman Gershman

Add initial mr schema

Commit:fa5bc32
Author:Roman Gershman

RPC: Add service descriptor

Commit:b8b495c
Author:Roman Gershman

Support custom field names + printing enums as ints

Commit:73c249f
Author:Roman Gershman

Fixes to pprint

Commit:034d875
Author:Roman Gershman

Fix plang/pprint code

Commit:7221d8e
Author:Roman Gershman

.

Commit:ee86e31
Author:Roman Gershman

Add file directory

Commit:b136e10
Author:Roman Gershman

Add more code to gaia, start using abseil-cpp and folly