* strictMissingRequire is not supported by recent Closure compiler

* JS: Explicitly require goog.proto2.Descriptor

* Use newer Closure deps builder in JS build

* Update JS compiler build file reference and instructions

Co-authored-by: penmetsaa <penmetsaa@google.com>

Compiling errors found when compiled against new version of closure-compiler
>> No warning class for name: ambiguousFunctionDecl
>> Same case for:
fileoverviewTags google/closure-compiler@04cba67
internetExplorerChecks google/closure-compiler@baab835
>> Moreover, deprecated syntax errors for defineClass
"[exec] /Users/lee/ClickToCloud/git/closure-library/closure/goog/base.js:2259: ERROR - [JSC_DEPRECATED_PROP_REASON]"

So we have updated the build.xml so that it no more considers these specific issues as errors and block the build/compilation.

* ShortNumberInfo metadata tooling - add missing fields to generated JSON.

Adjust javascript metadata generation tooling to include PhoneMetadata proto fields 29,30,31, and 33 that were previously excluded which are now needed for ShortNumberInfo.

* Add shortnumberinfo metadata to build metadata golden tests.

* Remove inaccurate comments in build tooling

* Add namespace to BuildMetadataJsonFromXml to support tool reuse

* Use updated build tooling to generate short number metadata file

* update phonemetadata.pb.js to match the current proto definition

* remove field 7 from phonemetadata.pb.js

* Update build tool to correctly namespacee the generated metadata files

* Stop field 32 from being populated as it is not used in the APIs

* remove metadata accessors for field 32.

* Add tests for connectsToEmergenyNumber and isEmergencyNumber.

Updated linter to include shortnumberinfo related files, and fixed some
lint issues existing with PhoneNumberUtil files.

* ShortNumberInfo functionality and tests ported. Unformatted and missing jsdoc

* Added comments, and fixed as many lint issues as possible.

* lint and comment review comments from andyst addressed.

* Add a golden metadata build test for short number metadata.

* Revert changes to the original phone metadata golden tests.

* Fix a lot of linting and jsdoc typing errors caught by the compiler.

* Add ShortNumberInfo to the javascript demo pages.

* Add ShortNumberIInfo porting to pending_code_changes.

* Add constants to golden tests.

* Update the build tooling

* uUdate pending changes to differentiate build and code changes

* Update build file, fix small test closure compilation issues

* Regenerate short number metadata to account for metadata updates between original generation and now.

* Move requires to alphabetical order

Tested and it detected goog.object was missing!

Added the missing requires this detected, removed the extra require. One
missing require was added manually (goog.object) since it's unable to
detect it.

Updated the readme: compiling everything seems to work at the moment.

for closure compiler: newer versions of the compiler have stopped ant
build support.

Review URL: https://codereview.appspot.com/8889044