Extract data-type management to callables

[wdalmut]

Instead of switch case management, i try another way using callables in order to convert data-type to InfluxDB

[wdalmut]

This PR includes an idea of @gianarb in order to force data-types in #48

[gianarb]

It sounds good.. :) In my opinion is a good solution.. It requires few works to implement it but is clear

[wdalmut]

Yeah, i think so,

$client->mark("serie", [
  "data"     => new IntType("12"),
  "value"    => new StringType("username"),
  "measured" => new FloatType(12),
]);

We will keep both solutions

$client->mark("serie", [
  "data"     => 12, // as int
  "value"    => "username",  // as string
  "measured" => 12.12, // as float
]);

We will drop the int as float support that now is enabled by default

[scrutinizer-notifier]

The inspection completed: 17 updated code elements