fix: gnokey add -derivation-path flag

[D4ryl00]

Fixes #5122

This PR updates gnokey add -derivation-path to actually derive, create, and persist the resulting accounts in the keybase, instead of only printing the derived addresses.

The -derivation-path flag is defined as an array, see

gno/tm2/pkg/crypto/keys/client/add.go

Line 36 in 33412c2

DerivationPath commands.StringArr

So this PR treats it as accepting multiple derivation paths in a single invocation.

• When multiple derivation paths are provided, gnokey creates and stores a separate key for each path.
• When a single derivation path is provided, the original key name is preserved.
• When multiple paths are supplied, derived key names are generated as: base-<account>-<index>.

Note for reviewers

The GitHub “Files changed” view for add.go isn’t very helpful because the change includes a refactor. The main new logic is concentrated around:
https://github.com/D4ryl00/gno/blob/f7d17190a123d51bf372804d8c07645bceacd6d0/tm2/pkg/crypto/keys/client/add.go#L236-L300

[Gno2D2]

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[codecov]

Codecov Report

❌ Patch coverage is 73.52941% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tm2/pkg/crypto/keys/client/add.go	73.52%	15 Missing and 12 partials ⚠️

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