Add grpc-mojo 0.2.7

[nsalerni]

Adds grpc-mojo 0.2.7, the gRPC client and server runtime (gzip + v1/v1alpha reflection).

Prefer this over #364 (0.2.6). Merge after the sibling bumps are on the channel:

• mojo-net 0.2.7 (#366)
• protomojo 0.4.3 (#369)
• mojo-tls 0.3.3 (#367)
• mojo-http2 0.2.9 (#368)

Version	0.2.7
Source	https://github.com/nsalerni/grpc-mojo/tree/v0.2.7
Pin	4ac8bcef9313f4fea3d044c1a5f4a01b7c397a1d
Artifacts	grpc.mojoc plus libgrpcstop (stop signals + gzip)
Sibling deps	mojo-net >=0.2.7,<0.3.0, mojo-http2 >=0.2.7,<0.3.0, mojo-tls >=0.3.3,<0.4.0, protomojo >=0.4.3,<0.5.0, zlib

Checklist

• Recipe specifies compatible MAX/Mojo (mojo-compiler >=1.0.0,<1.1.0)
• License file is packaged (license_file: LICENSE)
• Build number set to 0 (new package)
• N/A: bump build number

Please add the OK to test label. PR CI only runs when that label is present.

Install after publish:

pixi add grpc-mojo