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feat(context): introduce GetValueOptions

Introduce a second optional parameter of getter methods in Context
class. Modify `@inject` to accept GetValueOptions as part of the second
"metadata" argument. Modify `resolve` to pass `@inject` metadata to the
context getter method.

With this foundation in place, rework the way how nested properties are
retrieved: drop support for string-encoded "key#path" pair, use a new
option "property" instead.

BREAKING CHANGE: injection keys using "#" to build a key+path pair are
no longer supported. The property path should be specified via the new
options argument.

Before:

    const port = ctx.getSync('config#rest.port');
    @inject('config#rest.port')

Now:

    const port = ctx.getSync('config', {property: 'rest.port'});
    @inject('config', {property: 'rest.port'});

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