Update maxmind reader to v2

[blotus]

Update maxminddb-golang to v2.

The v2 of geoip2-golang has changed the name of some fields (IsoCode -> ISOCode), which would break any expression trying to access the IsoCode field of the value returned by GeoIPEnrich().
As such, drop usage of geoip2-golang, as it was just a thin wrapper on top of the reader, and use a custom struct to have better control of the struct fields.
This also allows us to create one less reader, we had 3 before:

• 1 lower level for the GeoIPRangeEnrich helper
• 1 wrapper for GeoIPEnrich
• 1 wrapper for GeoIPASNEnrich

With this change, we now only have 2 lower-level readers, one per database loaded.

Note: hub test failures need to be fixed in the hub before we merge.

[github-actions]

@blotus: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

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[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[blotus]

/kind chore

[codecov]

Codecov Report

❌ Patch coverage is 85.18519% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.84%. Comparing base (469b374) to head (ed5d10e).
⚠️ Report is 199 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/exprhelpers/geoip.go	78.94%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4112      +/-   ##
==========================================
- Coverage   62.96%   62.84%   -0.12%     
==========================================
  Files         464      464              
  Lines       33286    33288       +2     
==========================================
- Hits        20957    20920      -37     
- Misses      10212    10243      +31     
- Partials     2117     2125       +8     

Flag	Coverage Δ
bats	46.21% <70.37%> (+0.02%)	⬆️
unit-linux	35.67% <70.37%> (-0.07%)	⬇️
unit-windows	25.01% <7.40%> (-0.06%)	⬇️

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