Rename EiffelEventParser and EiffelEventParserIf

When an interface was extracted from EiffelEventParser in a previous
commit the implementing class kept the name EiffelEventParser to make
the diff more reviewable. In this change we rename the interface
`EiffelEventParser` and the implementation `EiffelEventParserImpl`
to align with the inofficial code-standard in Gerrit.

Solves: Jira GER-1715
Change-Id: I2ad5a139f0e6b983b615414450a9bc1a75a1128f
7 files changed
tree: bba172efc3a2aecf53fe7e425ca98e742abfcf03
  1. src/
  2. BUILD
  3. external_plugin_deps.bzl