wam: use gRPC for internal IPC.

wam: use gRPC for internal IPC.

Update WAM to use GRPC for internal IPC instead of Unix domain
sockets, dropping previous implementation. Update dependencies to use
grpc and protobuf.

chromium: 9d9fbef68a..9fe715038f
9fe715038f [op][agl][wayland] Drop window surface ID

wam: 491dcd1..3cc744f
3cc744f [wam][agl][wayland] Remove surface ID.
12d9778 [wam][agl][ipc] Rename WamSocketLockFile to WamIPCLockFile
fc5f7ff [wam][agl][ipc] Remove Unix Domain socket based IPC implementation
92a3356 [wam][agl][ipc] Introduce LaunchParams struct replacing LaunchData
61ce1d0 [wam][agl][ipc] Add gRPC implementation of internal IPC
ae51589 [wam][agl] Make IPC pass its parameters instead of storing them

Bug-AGL: SPEC-4252
Change-Id: I8edbe1d47a684f73feadfed6cbd944c01b6d2ceb
Signed-off-by: Jose Dapena Paz <jdapena@igalia.com>