Implement new persona creation

[NejcZdovc]

Right now when we call api server creates paymentId and wallets etc. New api should just crate payment Id and that is it. We will also remove anonize dependency with this move. As part of this effort we will also implement new settings api (#9132).

[LaurenWags]

Marked as QA/Blocked pending additional test plan information (requested from @NejcZdovc )

[LaurenWags]

Confirmed additional areas outside of test plan are not required for specifically testing this issue, thanks @NejcZdovc !

[LaurenWags]

Verified using

Brave | 1.13.73 Chromium: 84.0.4147.125 (Official Build) dev (64-bit)
-- | --
Revision | d0784639447f2e10d32ebaf9861092b20cfde286-refs/branch-heads/4147@{#1059}
OS | macOS Version 10.14.6 (Build 18G3020)

Confirmed plan 1 from brave/brave-core#6000 when enabling Rewards via panel, NTP widget, and brave://rewards page. Confirmed that in Preference file that brave.rewards.wallet has payment_id and seed populated.

Confirmed plan 2 from brave/brave-core#6000. Confirmed able to restore a wallet by manually copy/paste of words and import of backup file. Both were successful. Encountered #11235 while testing.

Confirmed plan 3 from brave/brave-core#6000. Confirmed migration message displayed. Link in message directs user to https://brave.com/faq/#convert-old-keys.

Plan 4 from brave/brave-core#6000 failed. ed follow-up issue #11298.

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Verification passed on

Brave | 1.13.77 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
-- | --
Revision | 4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS | Windows 10 OS Version 1903 (Build 18362.1016)

Confirmed plan 1 from brave/brave-core#6000 when enabling Rewards via panel, NTP widget, and brave://rewards page. Confirmed that in Preference file that brave.rewards.wallet has payment_id and seed populated.

Confirmed plan 2 from brave/brave-core#6000. Confirmed able to restore a wallet by manually copy/paste of words and import of backup file. Both were successful. Encountered #11235 while testing.

Confirmed plan 3 from brave/brave-core#6000. Confirmed migration message displayed. Link in message directs user to https://brave.com/faq/#convert-old-keys.

plan 4: Encountered #11298

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Verification passed on

Brave	1.13.79 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	Ubuntu 18.04 LTS

Confirmed plan 1 from brave/brave-core#6000 when enabling Rewards via panel, NTP widget, and brave://rewards page. Confirmed that in Preference file that brave.rewards.wallet has payment_id and seed populated.

Confirmed plan 2 from brave/brave-core#6000. Confirmed able to restore a wallet by manually copy/paste of words and import of backup file. Both were successful. Encountered #11235.

Confirmed plan 3 from brave/brave-core#6000. Confirmed migration message displayed. Link in message directs user to https://brave.com/faq/#convert-old-keys.

plan 4: Encountered #11298

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.13.84 x64 build

• Verified wallet is created automatically when rewards is enabled
• Verified importing wallet key restores the wallet correctly
• Verified entering random 16 words in restore wallet doesn't restore any wallet

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Verification passed on Samsung Tab A with Android 10 running 1.13.84 x64 build

• Verified wallet is created automatically when rewards is enabled
• Verified importing wallet key restores the wallet correctly
• Verified entering random 16 words in restore wallet doesn't restore any wallet