[foreign-memaccess+abi] RFR: 8293495: Revisit name of SymbolLookup::lookup

[Maurizio Cimadamore]

This simple patch changes the name of SymbolLookup::lookup to SymbolLookup::find.

This change was suggested during many rounds of API reviews, as the term "lookup" can refer to both a noun and a verb and, sadly, the API is using both forms.

Since we already have a precedent in the JDK for using Lookup in the noun form (e.g. method handle lookup), I have decided to rename the method to something more neutral like "find", which, coincidentally is also the term we settled on in the javadoc in order to avoid confusion.

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Commit messages:
 - Initial push

Changes: https://git.openjdk.org/panama-foreign/pull/716/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=716&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293495
  Stats: 70 lines in 19 files changed: 0 ins; 0 del; 70 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/716.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/716/head:pull/716

PR: https://git.openjdk.org/panama-foreign/pull/716