Merge #19335: wallet: Cleanup and separate BerkeleyDatabase and BerkeleyBatch

74507ce71eb61105fb3ae8460999099234ca7b8b walletdb: Remove BerkeleyBatch friend class from BerkeleyDatabase (Andrew Chow)
00f0041351bcd6ddbab110df1189f79ce011e192 No need to check for duplicate fileids in all dbenvs (Andrew Chow)
d86efab37002841fd059251672e1ec1a977b743f walletdb: Move Db->open to BerkeleyDatabase::Open (Andrew Chow)
4fe4b3bf1b152877677a6115f82aefaf318dd514 walletdb: track database file use as m_refcount within BerkeleyDatabase (Andrew Chow)
65fb8807ac402d1e924fd85969b5837c192bf59f Combine BerkeleyEnvironment::Verify into BerkeleyDatabase::Verify (Andrew Chow)

Pull request description:

  `BerkeleyBatch` and `BerkeleyDatabase` are kind of messy. The goal of this is to clean up them up so that they are logically separated.

  `BerkeleyBatch` currently handles the creation of the `BerkeleyDatabase`'s `Db` handle. This is instead moved into `BerkeleyDatabase` and is called by `BerkeleyBatch`.

  Instead of having `BerkeleyEnvironment` track each database's usage, have `BerkeleyDatabase` track this usage itself with the `m_refcount` variable that is present in `WalletDatabase`.

  Lastly, instead of having each `BerkeleyEnvironment` store the fileids of the databases open in it, have a global `g_fileids` to track those fileids. We were already checking fileid uniqueness globally (by checking the fileids in every environment when opening a database) so it's cleaner to do this with a global variable.

  All of these changes allow us to make `BerkeleyBatch` and `BerkeleyDatabase` no longer be friend classes.

  The diff of this PR is currently the same as in ##18971

  Requires #19334

ACKs for top commit:
  laanwj:
    Code review ACK 74507ce71eb61105fb3ae8460999099234ca7b8b
  ryanofsky:
    Code review ACK 74507ce71eb61105fb3ae8460999099234ca7b8b. No changes since last review other than rebase

Tree-SHA512: 845d84ee1a470e2bf5d2e2e3d7738183d8ce43ddd06a0bbd57edecf5779b2f55d70728b1b57f5daab0f078650a8d60c3e19dc30b75b36e7aa952ce268399d5f6

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