feat(core): add keys to tokens

[raveclassic]

This PR adds a key: Key property to the result of token call - this makes it much easier to work with tokens by eliminating the need of exporting separate key constants:

// before
const FOO_KEY = 'foo'
const foo = token(FOO_KEY)<string>()
const bar = injectable(foo, foo => 'result')
const result = bar({[FOO_KEY]: 'foo'})

// after
const foo = token('foo')<string>()
const bar = injectable(foo, foo => 'result')
const result = bar({[foo.key]: 'foo'})

BREAKING CHANGE: fp-ts package is removed as useless

cc @devfive @Fyzu @mankdev

Notes:

• it seems @injectable-ts/fp-ts is absolutely useless as we can't force constraints on the E argument in interface URItoKind2<E, A> so that E is of shape UnknownInjectableTree
• I had to change how types are encoded on Injectable interface and how they are inferred using InjectableValue/InjectableDependencies - we relied on type argument position before (first is for dependencies, second is for value) but this breaks if we have a TokenInjectable with 3 type arguments; so now we store the arguments as virtual fields (similar to zod schemas)
• it don't really like all this new mess with type casts but it won't work otherwise (see above ☝️ )

[Fyzu]

I like it! Mb we can provide better typings for DepencyProvider?

[raveclassic]

Closing as fixed by #10