Get Ayah from URL and /tafsir set and /atafsir set commands

[itzmk21]

Added the context menu command that gets the Qur'an ayah from a URL
This was tested with the following links, all of which work as intended:

[
            'https://quran.com/'
            'https://quran.com/',

            'https://quran.com/12:5',
            'https://quran.com/10:19/',
            'https://quran.com/7:12?param=value',
            'https://quran.com/154:3?param=value/',
            'https://quran.com/22:1-5/?param=value',
            'https://quran.com/11:45-542/?param=value/',

            'https://quran.com/12/5',
            'https://quran.com/10/19/',
            'https://quran.com/7/12?param=value',
            'https://quran.com/154/3?param=value/',
            'https://quran.com/22/1-5/?param=value',
            'https://quran.com/11/45-542/?param=value',
        ]

Closes #40

Rewrote the DBHandler child classes for less repetition
Made tafsir commands into a group:

• /tafsir get ... /tafsir set_default_tafsir - not a flattering name, but up to you
• /atafsir get ... /atafsir set_default_atafsir

This requires you to create new tables:
For Tafsir columns:

• server which is the guild_id so up to you what datatype
• tafsir which is the tafsir_name similar to the translation name similarly stored, so a string-based datatype e.g "maarifulquran" will be stored
  For Arabic Tafsir columns:
• server - the guild_id
• atafsir (could change the name), e.g: "tabari" will be stored

Closes #55

Use the app_commands.Range annotation to have built in range check, that checks if the page is between 1 and 604 for /mushaf by_page as well as for the day month and year args for /calendar commands

Update the help command embed to make mention slash commands - closes #62