Refactor: Simplify input handling

[matyascimbulka]

Based on this comment by @metalwarrior665 I've decided to have a look at simplifying input handling.

To simplify things I have decided to remove the defaults object and rewrite the validateAndFillInput function to use the input schema directly.

How it works

Normal mode

In normal mode the input is received via Actor.getInput() which is then processed using the processInput function where its validated and completed. This function then returns the necessary crawler options to complete the query.

Standby mode

When standby mode is initiated it will receive its initial input via Actor.getInput(). This input is processed using the processStandbyInput which returns crawler options for all possible crawlers which is then used to start them. Then it waits for request.
When a request arrives its parameters are parsed using the parseParameters function which returns Partial<Input> object. This object is then directly fed into the parseInput function where its validated and completed like standby input.

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Here are example runs:

• Normal mode: https://console.apify.com/view/runs/US1wa7mOJMBNvT0X6
• Standby mode: https://console.apify.com/view/runs/1cLDcDcZRbz2i0ov7

[jirispilka]

Thank you!
Looks great.

As Lukas suggested, can you also remove table with query params from README.md?
Since the inputs for normal mode and standby are 1:1. It will greatly shorten the README.

Otherwise, LGTM.

[jirispilka]

I would remove this commented out code

[matyascimbulka]

@jirispilka I have removed the dead code and remove the table from README.md.

[MQ37]

LGTM 👍

[matyascimbulka]

Thanks I'll merge and deploy the changes.

@MQ37 This will probably break your other PR (#69)