[Toybox] [PATCH] Add bzip2 support to tar.

[enh]

Also trivial cleanup of pipe -> xpipe.

Bug: http://b/38215123
---
 tests/files/tar/tar.tbz2 | Bin 0 -> 168 bytes
 tests/files/tar/tar.tgz  | Bin 0 -> 166 bytes
 tests/tar.test           |  14 ++++++++++++++
 toys/pending/tar.c       |  23 ++++++++++++-----------
 4 files changed, 26 insertions(+), 11 deletions(-)
 create mode 100644 tests/files/tar/tar.tbz2
 create mode 100644 tests/files/tar/tar.tgz
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