Add Solana

[sneurlax]

It's hidden behind a toggle in the developer menu.

Thank you @detherminal for this work

We still need:

• to use Tor with Solana's RpcClient
• a Solana logo

Please also refer to the comments on #816, we may want to track issues for:

• better address validation
• sending below the minimum rent amount / closing the account

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.10294% with 269 lines in your changes are missing coverage. Please review.

Project coverage is 5.40%. Comparing base (414803d) to head (f5da852).
Report is 68 commits behind head on staging.

Files	Patch %	Lines
lib/wallets/wallet/impl/solana_wallet.dart	0.00%	170 Missing ⚠️
lib/wallets/crypto_currency/coins/solana.dart	0.00%	17 Missing ⚠️
...gs_views/global_settings_view/hidden_settings.dart	0.00%	16 Missing ⚠️
lib/utilities/prefs.dart	0.00%	9 Missing ⚠️
lib/utilities/enums/coin_enum.dart	27.27%	8 Missing ⚠️
lib/utilities/constants.dart	0.00%	7 Missing ⚠️
...gs_view/manage_nodes_views/add_edit_node_view.dart	0.00%	6 Missing ⚠️
...ngs_view/manage_nodes_views/node_details_view.dart	0.00%	5 Missing ⚠️
lib/utilities/default_nodes.dart	0.00%	5 Missing ⚠️
lib/widgets/node_card.dart	0.00%	5 Missing ⚠️
... and 10 more

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Additional details and impacted files

@@ Coverage Diff @@## staging #821 +/- ##
==========================================
- Coverage 5.83% 5.40% -0.44% 
==========================================
Files 741 780 +39 Lines 70283 75414 +5131 ==========================================
- Hits 4100 4075 -25 - Misses 66183 71339 +5156 

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