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maprule: add implementation and tests
maprule() is an improved version of native.genrule(), with the following advantages: - Maprule can process source files in parallel, creating separate actions for each of them. - Maprule does not require declaring all output files. Instead you declare templates for the output files produces for each source. Therefore N source files and M templates produce N*M outputs. - Maprule supports both Bash or cmd.exe syntax for its commands via the specialized rules bash_maprule and cmd_maprule. - Maprule's cmd attribute does deliberately not support $(location) expression nor Make Variables, in order to avoid issues and challenges with quoting. (Particluarly in case of cmd.exe passing empty arguments is impossible). These paths can be passed as envvars instead. - Maprule's add_env attribute does support $(location) expressions (and some extra placeholders) and is the idiomatic way to pass execpaths of labels in "tools" or "srcs" (the shared sources available for all actions) to the command. See bazelbuild/bazel#4319
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